I am not sure what other versions may be affected, however I am noticing this very specific issue when it comes to using slime block retraction, when also retracting a sticky piston

I can only provide some screenshots to help visually explain the issue. I will attempt to explain

When using two sticky pistons facing any direction, and they push a sticky piston and a slime block, when retracted, only the sticky piston, is retracted. however. there is a small fix/workaround. if the timings of these two sticky pistons are different by 1 repeater tick, it works.

My images will hopefully explain better. I took images step by step.
(I apologize if they are out of order!)