Signs sometimes don't update correctly

[H2ofiremaster]

Describe the bug
Signs sometimes don't update correctly, saying 'Starting...' even if the arena is empty, or not switching to 'Running.' once the arena starts, although the latter is the only one I'm able to reproduce.

To Reproduce

1. Get 2 players
2. Position 1 player by the sign
3. Have the other player join an arena with 'Minimum Players' set to 1
4. Wait for the game to start
5. Notice that the sign doesn't update to 'Running...'

Expected behavior
Signs should always update to the correct state.

Minecraft version information

• Minecraft Version: 1.21.1
• Server Software: Paper
• Server Software Version: 119
• Plugin Version 1.5.2