Messages from and to others behaves inconsistantly.
Forum reference: https://forum.sailfishos.org/t/whisperfish-the-unofficial-sailfishos-signal-client/3337/382?u=poetaster
And I think it's the same issue:
Its a volla phone (community adaptation), 4.1
I've attached 2 files. the wflog2 file shows a session where it worked in both directions wflog there was a failure .
I just tested with a colleague, details scrubbed.