Bug Report | 1.20 block re-sync breaks world replication

[jonesdevelopment]

Information

When does the bug occure?

Blocks aren't resynced to 1.8 clients when running a 1.9+ server. That means that if you break the block below you block on 1.8 on a 1.9+ server, it will be gone for you, but not on the server. This can cause some checks to false.

Cardinal Version

latest

Spigot Version

1.20.4 Paper (cardinal.micartey.dev)

Additional information

No response

[micartey]

Happened thus far only on certain blocks (e.g. extended pistons).
Other blocks haven't been found so far...

The server doesn't send updates and a player won't be flagged for this — The flag appears to be due to continuous teleports, which is an entirely different issue.

The question is when and how to re-sync the blocks.
From the players' perspective, the blocks are gone.