The changelogs for 1.16.20 says they fixed the bug where command blocks would stop working and you would have to make a new one. Well, it still happens. And its really annoying. Imagine. You’re in your world about to create something with several command blocks. Something doesnt work but the command is right. The command block has stopped working. You think to yourself, "I thought they patched this!". Please actually fix it.

What I expected to happen:

Command blocks wouldn’t stop working unexpectedly.

What actually happened:

Some command blocks stopped working and had to be replaced.