Pathing Bug

While Paving my road on my latest snapshot world i couldn't pave a grass block this block was on the edge of the path and right next to it was a piston facing upwards with a button on its side this button was not shown as a full block and its hit box was fine but i couldn't pave the block even though the button was not on the grass block hopefully you can fix this bug!
Ps: is it possible to get a bug fixing cape!

 

also text renders behind armour points in hot bar