Command blocks, structure blocks, and jigsaw blocks on realms revert to previous state after any change

Command blocks can no longer store new data, they erase or revert to old data. The commands stored erases. When changing into different kind of command blocks like chain and repeat, they will revert back to the original.

Steps to Reproduce

1. Get command block.
2. Place command block.
3. Open command block and type something or change types.
4. Close command block and reopen.

Observed Result
Everything added or changed is gone

Expected Behavior
Changes made to command blocks will be retained