When a block that has an OnPlace event is placed by a script, the OnPlace event is not executed, this affects any chain placement that a block has, or any slightly complicated placement, OnPlace does seem to work correctly if commands are used.

When I mean placed by script, I mean when you use: ^{block.above().setPermutation(block.above().permutation.withState(state, stateValue));}

Any block placed this way will not correctly execute its OnPlace event.

Here I leave a Onedrive link with some videos of how it worked in 1.21.10, and another in 1.21.21 (now): Minecraft Bug Showcase