Scaffolding Failing in specific blocks

Scaffolding breaks (drops) when it falls above the following blocks:

 

Modified grass_block (grass_path, farmland, etc...)

 

Torches/Signs.

 

All flowers (except any type of grass)

 

and many others that SAND breaks when falling into.

 

It was really annoying when i was in the middle of an village experimenting with scaffolding...