The issue with Strawberry leaving open pipelines which leads to open files should be fixed in version 1.2.1. However the new version won't work on Ubuntu 22.04 as Strawberry now requires a newer Qt version than is available on that Ubuntu version, consider upgrading to Ubuntu 24.04 (Noble).
The "Your GStreamer installation is missing a plug-in" error could be a GStreamer bug, maybe a newer GStreamer version solves that.