From GitHub comments: https://github.com/signalapp/Signal-Android/issues/10247
Greyson:
> Hi there, sorry, this issue was fixed in 5.17 (which hit 100% production on 7/21)
They had a difficult to reproduce problem reported in late December 2020, and got the fix rolled out seven months later.
Not sure your criticism "absolutely inexcusable slop code" is well considered.