Redstone tools randomly disappear

It was happening for a long time, sometime id find that a lever or wall button is missing (I have many of them).
Also yesterday i found that one of house lamps stopped working - the solar panel gone, its in a place you cant reach without flying.
and i got it - thats a bug.

Edited: Today i accidently found this (See screenshot), i guess this is one of my missing solar panels hehe