Add a gamerule that would reintroduce mobs being able to spawn on scaffolding, as well as disabling pathfinding on Scaffolding. im sucky at Java, but I think the rules can probably be named something like this, as well as what they'd look like in the Wiki

/carpet-fixes reIntroduceMobCanSpawnOnScaffolding

Type: Boolean
Default: False
Required options: True, False
Category: REINTRODUCE

/carpet-fixes reIntroduceScaffoldingPreventsPathfinding

Type: Boolean
Default: False
Required options: True, False
Category: REINTRODUCE

I'm too busy to work on my mods atm. I also planned to move all the re-introduce options to their own mod, but never got the time to do it.