Signs on fence posts cannot be edited with writing if you place a sign on a fence you cannot write on it it will just place and it will be blank

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here: it should of let me edit the sign

What actually happened was...:
I was placing signs to try make a Direction board in my server spawn and I cudnt edit signs on fences

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. Place a sign on a fence post and you cannot write on it
3. ...