Note: The reproduction steps are with minecart & redstone experiments enabled HOWEVER it happens with them disabled as well. It's just more consistent

If you relog, sometimes the piston will not get unpowered properly.
This will break the clock.
Minecraft 2024.09.05 - 15.41.16.03.mp4

Reproduction Steps

• Build this
  
• Place a minecart on the detector rail
• Pause and leave the world as the minecart lands
• Rejoin the world
  (You may need to retry the last 2 steps a few times)

Observed Result

• The piston stays powered and the clock stops
  result.mp4

Expected Result

• The clock wouldn't break on relog