I am the maintainer of the GagBook app and I am trying to debug such issues since a long time now. There are some app related bugs that cause some app crashes, but in my opinion the main issues are caused by the underlying libraries provided by SFOS.
I was able to log the following a few SFOS releases ago (on 12th June 2021):
GStreamer-CRITICAL **: 13:24:58.970: gst_query_set_nth_allocation_pool: assertion 'index < array->len' failed
GLib-GObject-WARNING **: 13:24:58:995: invalid cast from 'GstVideoBufferPool' to GstDroidBufferPool'