So the prerequisite for this that the upgrade did fail? Did you happen to check at any point what version of ConnMan you had when that happened?
This could really happen when the upgrade for some reason fails, iptables is updated to 1.8.7+git1 but ConnMan hasn’t updated to what the upgrade should bring = 1.32+git180.2. There was an update to iptables which caused the library version to be updated. By completing the update this should be fixed but symlinking the lib temporarily is ok in order to finish the upgrade.