Message and pill from historical profile not highlighted

[MadLittleMods]

Steps to reproduce

1. Have someone mention your user with a pill
2. Change your display name to something unrelated like flyingbutterfly
3. Have someone mention your user with a pill (the pill should be your new display name now)
4. Change your display name back to your original name
5. Refresh the page, maybe a couple of times
6. Notice how the message and pill from when your display name was different isn't highlighted red anymore

Outcome

What did you expect?

Pills for all historical profiles of me are highlighted.

What happened instead?

The screenshot is from the perspective of erictroupetester user who changed their name to flyingbutterfly. After the refresh, all of the pills also show erictroupetester instead of the historical profile at the time (this is tracked by #4677) (I don't have the feature_use_only_current_profiles Lab enabled)

Problem message source for reference:

{
  "type": "m.room.message",
  "room_id": "!HBehERstyQBxyJDLfR:my.synapse.server",
  "sender": "@ericgittertester:my.synapse.server",
  "content": {
    "org.matrix.msc1767.message": [
      {
        "body": "flyingbutterfly: direct pill mention",
        "mimetype": "text/plain"
      },
      {
        "body": "<a href=\"https://matrix.to/#/@erictroupetester:my.synapse.server\">flyingbutterfly</a>: direct pill mention",
        "mimetype": "text/html"
      }
    ],
    "body": "flyingbutterfly: direct pill mention",
    "msgtype": "m.text",
    "format": "org.matrix.custom.html",
    "formatted_body": "<a href=\"https://matrix.to/#/@erictroupetester:my.synapse.server\">flyingbutterfly</a>: direct pill mention"
  },
  "origin_server_ts": 1649964056179,
  "unsigned": {
    "age": 5834917
  },
  "event_id": "$zTz0pkbepiOiTWOl1xrgEJGu99okiFtZ5_My1jFIsuc",
  "user_id": "@ericgittertester:my.synapse.server",
  "age": 5834917
}

Operating system

macOS 12.3

Browser information

Chrome version 100.0.4896.75

URL for webapp

http://localhost:8080/

Application version

Latest develop from 2022-04-13

Homeserver

localhost

Will you send logs?

No