This is still an issue in 1.20.50. I have attached a world with dry scaffolding, waterlogged scaffolding, a water source above scaffolding, and flowing water above scaffolding. You cannot descend through scaffolding that has water above it.
Pygochelidon
This is still an issue in 1.20.50. I have attached a world with dry scaffolding, waterlogged scaffolding, a water source above scaffolding, and flowing water above scaffolding. You cannot descend through scaffolding that has water above it.