If this is happening on OS 4.1 as well, then it’s probably not a Nothing OS bug at all —
it points to Android System WebView, which updates through the Play Store
independently of the OS version.
Can those of you affected check which WebView version you have?
Settings > Apps > Show system apps > Android System WebView (note: on OS 5.0 beta this
screen freezes for me, so you may need to use the Play Store page instead:
play.google.com/store/apps/details?id=com.google.android.webview).
There’s a reported WebView regression this month (153.0.8010.37) that kills the
RenderThread with SIGTRAP across unrelated host apps, which matches this behaviour.
If we all turn out to be on the same WebView build, that’s the culprit — and the fix
is Google’s, not Nothing’s. Uninstalling WebView updates from that Play Store page
should restore a working version in the meantime.