See attached screenshot. Since there are signs attached to both the front and back of the bed, you would expect all of the signs to drop when the bed is broken. What actually happens is the signs that drop are the ones that are attached to the part of the bed you broke. The signs attached to the other side are lost.
Linked issues
duplicates 1
Attachments
Comments 4
They're very closely related, but fixing one of the two issues doesn't necessarily cause the other one to be fixed as well. Thus I don't think merging is necessary.
Updated MC-136085 to be more generic and therefore closed this report as duplicate.
If this isn't going to merge with MC-136085, add 19w45b to affected versions.