The bug
If you place restone at differents heights, the redstone does't activate on the lower level, this happens if you place the redstone on the new moss block.
How to reproduce:
Place a redstone torch with redstone dust next to it
Place a moss block on the other end of the redstone dust
Place redstone dust on the moss block and down on the floor on the other side
❌ notice the last placed redstone dust does not light up
Linked issues
Attachments
Comments
Could be intentional, however, I can confirm. Closely relates to MC-206131.
Also relates to MC-3311

Basically, the moss block behaves like glass blocks do, in respect to redstone.
moss is most likely a transparent block (or whatever it was called), like glass or glowstone