Player can break block in spawn protection they last hit before being deopped

The bug

When an op player hits (=left click once) a block in the spawn protection and is afterwards de-opped, they can still break that block.

How to reproduce

1. Start a server

2. Op any player other than yourself (from the console) to activate spawn protection

   /op Notch

3. Op yourself (from the console)

   /op @p

4. Set your gamemode to survival

   /gamemode survival @p

5. Click a block in spawn protection once

6. De-op yourself

   /deop @p

7. Try breaking the block you hit in the previous step
   ❌ You can successfully break it