SDK producing invalid mentions

[krille-chan]

Bug Description

produces m.mentions like the following

"m.mentions": {
      "user_ids": [
        "@redacted:matrix.org:"
      ]
},

Steps to Reproduce

when you mention someone with a symbol directly after it like “:” or smth

Expected Behavior

it should strip that and produce valid mentions

App Version

2.5.1

Platform

Android (F-Droid)

Additional Platform Information

Android

Additional Context

(btw element x refuses to render these messages, which is silly, but the mention do be invalid or at least silly)