Timestamp overlaps if message is too short

[bkil]

Can be reproduced in both Hydrogen and on the archive.

• https://archive.matrix.org/r/securemessagingapps:matrix.org/date/2023/04/09T08:21?at=$6qAucTI7T7DkikLMav4MuJ5y43H9iPYq6reTdWP_JH0

{
  "content": {
    "body": " ד",
    "msgtype": "m.text"
  },
  "origin_server_ts": 1680954385467,
  "room_id": "!sOLQNHloevPHIEWcYN:matrix.org",
  "sender": "@christoph.bugel:matrix.org",
  "type": "m.room.message",
  "unsigned": {
    "age": 4528028736
  },
  "event_id": "$6qAucTI7T7DkikLMav4MuJ5y43H9iPYq6reTdWP_JH0",
  "user_id": "@christoph.bugel:matrix.org",
  "age": 4527829384
}