I do not get the thumbnail error, but here is more output from journalctl - I am not 100% sure all of this is related to the camera though.
Jun 28 09:44:19 Xperia10III [9359]: [W] unknown:20 - file:///usr/lib64/qt5/qml/com/jolla/camera/settings/CameraDeviceToggle.qml:20: TypeError: Cannot read property 'length' of undefined
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:19 Xperia10III kernel: qcom_rpmh DRV:apps_rsc TCS Busy, retrying RPMH message send: addr=0x30010
Jun 28 09:44:20 Xperia10III kernel: binder: 3290 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 25103 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 25103 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 3290 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 25103 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 3290 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 3290 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 25103 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 3290 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: binder: 25103 RLIMIT_NICE not set
Jun 28 09:44:20 Xperia10III kernel: CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 872 CAM_ACQUIRE_DEV Success, sensor_id:0x486,sensor_slave_addr:0x34
Jun 28 09:44:20 Xperia10III kernel: CAM_INFO: CAM-SENSOR: cam_sensor_util_request_gpio_table: 1073 No GPIO data
Jun 28 09:44:20 Xperia10III kernel: CAM_INFO: CAM-SENSOR: msm_cam_sensor_handle_reg_gpio: 1745 Input Parameters are not proper
Jun 28 09:44:20 Xperia10III kernel: CAM_INFO: CAM-HFI: cam_hfi_resume: 679 Resume IO1 : [0x10c00000 0xcf300000] IO2 [0xe0200000 0x1ed00000]
Jun 28 09:44:21 Xperia10III kernel: CAM_ERR: CAM-ISP: cam_ife_csid_cid_reserve: 1040 CSID:3 IPP resource not available
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-ISP: cam_ife_hw_mgr_print_acquire_info: 692 Successfully acquire single IFE[2 -1] with [12 pix] [0 pd] [1 rdi] ports for ctx:0
Jun 28 09:44:21 Xperia10III kernel: CAM_WARN: CAM-PERF: cam_isp_packet_generic_blob_handler: 5605 Deprecated Blob TYPE_BW_CONFIG
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-ISP: cam_ife_csid_set_csid_clock: 4259 CSID clock rate 127500000
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-ISP: cam_ife_csid_set_csid_clock: 4259 CSID clock rate 127500000
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-CSIPHY: cam_csiphy_core_cfg: 1137 START_DEV: CSIPHY_IDX: 0, Device_slot: 0, Datarate: 1020000000, Settletime: 4000000000
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-SENSOR: cam_sensor_driver_cmd: 964 CAM_START_DEV Success, sensor_id:0x486,sensor_slave_addr:0x34
Jun 28 09:44:21 Xperia10III kernel: CAM_INFO: CAM-ISP: __cam_isp_ctx_sof_in_epoch: 1583 First SOF in EPCR ctx:0 frame_id:1 next substate EPOCH
Jun 28 09:44:21 Xperia10III [9359]: [D] onCompleted:105 - ViewPlaceholder requires a SilicaFlickable parent
Jun 28 09:44:21 Xperia10III kernel: CAM_WARN: CAM-PERF: cam_icp_packet_generic_blob_handler: 4497 Using deprecated blob type GENERIC_BLOB_CLK
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:21 Xperia10III lipstick[8415]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8224270] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
Jun 28 09:44:21 Xperia10III lipstick[8415]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8224270] moov atom not found
Jun 28 09:44:21 Xperia10III lipstick[8415]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x6732210] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
Jun 28 09:44:21 Xperia10III lipstick[8415]: [mov,mp4,m4a,3gp,3g2,mj2 @ 0x6732210] moov atom not found
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:21 Xperia10III [9359]: [W] unknown:0 - QImage::scaled: Image is a null image
Jun 28 09:44:22 Xperia10III kernel: sec_ts 1-0048: [sec_input] sec_ts_read_event: STATUS 1d 69 1 0 0 0 0 0
Jun 28 09:44:22 Xperia10III kernel: sec_ts 1-0048: [sec_input] sec_ts_read_event: STATUS 1d 69 0 0 0 0 0 0
Jun 28 09:44:22 Xperia10III kernel: sec_ts 1-0048: [sec_input] sec_ts_read_event: STATUS 1d 69 1 0 0 0 0 0
Jun 28 09:44:22 Xperia10III kernel: sec_ts 1-0048: [sec_input] sec_ts_read_event: STATUS 1d 69 0 0 0 0 0 0
Jun 28 09:44:23 Xperia10III kernel: pm7250b_charger: somc_aicl_irq_handler: IRQ: aicl-done
Jun 28 09:44:23 Xperia10III kernel: sec_ts 1-0048: [sec_input] [P] tID:0 x:565 y:2045 z:40 major:10 minor:10 tc:1 type:0 noise:0
Jun 28 09:44:23 Xperia10III kernel: sec_ts 1-0048: [sec_input] [R] tID:0 mc:8 tc:0 lx:567 ly:2051 v:0100 cal:A2 id(0,0) p:0 noise:0 lp:(0)
Jun 28 09:44:24 Xperia10III kernel: msm_vidc: high: 00000001: ....e: Opening video instance: 0000000000000000, 0
Jun 28 09:44:25 Xperia10III kernel: binder_do_set_priority: 242 callbacks suppressed
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:25 Xperia10III kernel: msm_vidc: err : ffffffff: .....: DBLP Set: status 0
Jun 28 09:44:27 Xperia10III lipstick[8415]: [D] onTriggered:102 - Application "Camera" with PID 9359 is not responding
Jun 28 09:44:30 Xperia10III kernel: binder_do_set_priority: 294 callbacks suppressed
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3263 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3262 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3262 RLIMIT_NICE not set
Jun 28 09:44:30 Xperia10III kernel: binder: 3262 RLIMIT_NICE not set
Jun 28 09:44:33 Xperia10III kernel: sec_ts 1-0048: [sec_input] [P] tID:0 x:852 y:395 z:41 major:10 minor:10 tc:1 type:0 noise:0
Jun 28 09:44:33 Xperia10III kernel: sec_ts 1-0048: [sec_input] [R] tID:0 mc:7 tc:0 lx:856 ly:403 v:0100 cal:A2 id(0,0) p:0 noise:0 lp:(0)
Jun 28 09:44:33 Xperia10III lipstick[8415]: [D] onClicked:89 - User terminated the unresponsive application "Camera" with PID 9359
Jun 28 09:44:33 Xperia10III kernel: binder_alloc: 9359: binder_alloc_buf, no vma
Jun 28 09:44:33 Xperia10III kernel: binder: 3980:4288 transaction failed 29189/-3, size 176-0 line 3274
Jun 28 09:44:33 Xperia10III sensorfwd[3277]: [SocketHandler]: Socket error: QLocalSocket::PeerClosedError
Jun 28 09:44:33 Xperia10III kernel: binder: send failed reply for transaction 11696005 to 3980:3372
Jun 28 09:44:33 Xperia10III kernel: binder: release 9359:3419 transaction 11691225 out, still active
Jun 28 09:44:33 Xperia10III kernel: binder: undelivered TRANSACTION_COMPLETE
Jun 28 09:44:33 Xperia10III sensorfwd[3277]: [SocketHandler]: Noticed lost session: 24