Like the title suggests, right clicking on any sign variant (any kind of wood, and both standing/wall) has no effect.
You can still left click to select the different properties completely fine.
However, right clicking has no effect and no message as well, not even an error.
How to reproduce:
1: Place any sign in any way
2: Right click with a debug stick
3: Glitch occurs.
I can only imagine that this glitch exists due to the new dye behaviors, and that this is just an oversight.
Like other blocks with block interactions, you'll need to be sneaking