Signs dissapear leaving floating text

Put the summary of the bug you're having here

What I expected to happen was...:
Signs should be able to.be seen but they just dissapear leavimg floating text.

What actually happened was...:
same as last answer

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... it just happens. can only see text and a cobblestone or dirt background is bad
3. ...