What is the bug:
In the edit screen of the sign block (for both hanging and wall variants) the sign shown in the background renders based off of the sign's model rather than off of a texture, where as in the hanging sign edit screne a texture is used for each wood type variant.
Screenshots/Videos:
Hanging sign textures
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Possible fix:
Attatched is a zip file containing textures that could be used for the edit screens.
[media]
[media]
Notes:
It is expected that just like with the hanging sign, both standing and wall sign variants would have a unique texture used inside the edit screen. Without it, resource packs are disallowed the ability to change the texture shown in the edit screen seperately from the respective block texture/model.
Linked issues
relates to 25
MC-274247
The right/left top, middle, and bottom hair planes of a strider cannot be independently retextured
Resolved
MC-256807
Hanging sign GUIs don't always reflect their models accordingly
Reopened
MC-271983
The right/left ears, front legs, and back legs of a polar bear cannot be independently retextured
Resolved
MC-271773
The right/left arms and legs of all skeleton variants cannot be independently retextured
Resolved
MC-274246
The legs of a pig cannot be independently retextured
Resolved
20 more links
This is more a feature request than a bug. The sole reason hanging signs have a unique texture file is for the chains. As a result, they also do not properly represent the block state they're in.