UPDATE
I had to create a brand new world in order to make repeaters again. Still can't on older worlds.
I can't take a screenshot on my phone
I have issues with a piston T-Flip Flop as well.
I have gotten a mono-stable circuit to work. It does have visual glitches but still works.
I haven't had this issue with slime blocks.
As Above. You can't power the block the repeater is on from above. The Piston needs to be powered directly or the block has to be powered from the sides or dust on top.
That was it. I can make them again now.
Please fix the recipe bug then ty