The bug
Signs seem to be using the old and outdated texture on their back. The stems might also be the old texture, but it's too little detail for me to notice.
How to reproduce
Requires no steps. just put down any sign and look at both the front and back.
Linked issues
Attachments
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-154006, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Can confirm this for Minecraft 19w40a