Text on signs is not displayed in reflections:

Steps to reproduce:

1. Find a reflective block [I attach an small .mcpack file below which replaces *cracked nether brick* with a Full mirror block so you can test it out yourselves (works with any other reflective object or any level of reflectivity, this is just an example)]
2. Place down a sign and write something.
3. Place reflective block near it in a way that you can see front of sign in it, where text is.

Observed results:
Text on sign is not reflected.

Expected results:
Text on sign should appear in reflection.

with mirror I mentioned earlier: