See if it is the keyboard. It has been documented that Graphene's default keyboard and FlorisBoard are crashing when apps use a "Visual Mapper" to show people's names intead of their pubkeys.
Anysoft, GBoard and Unexpected Keyboards seem to not have this issue.
Unexpected board also solved that weird backspace/delete while typing issue.
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yeah it's part of the same issue.
Little late but FYI, I've confirmed this is related to word/correction suggestions. If disabled, mentions will work regardless of keyboard.
Also the backspace issue.