Ominous banner not breaking

Put the summary of the bug you're having here

What I expected to happen was...:
that the ominous banner would break

What actually happened was...:
I placed a ominous banner and when I tried to break it, it wouldn't. This was in a desert biome  and when I broke the sand beneath it, it broke as it should.

Steps to Reproduce:
1. Place the ominous banner
2. try to break it
3. ...