Strange "missing" flag texture in part thumbnail

[Coriform]

For some reason, in the VAB (or SPH), some of the part thumbnails show a white quad in the location of where the flag decal would normally be placed. This isn't happening for all parts (most of them don't show the flag in the preview thumbnail, as expected).  This is happening in a fresh, un-modded install. What's causing this? Here's a screenshot exhibiting the behavior:

[swjr-swis]

It's been reported already (http://bugs.kerbalspaceprogram.com/issues/14467), but you can confirm it.

[Capt. Hunt]

Ive noticed this on a few mod parts that are rigged for flags as well, such as the KSO.

[swjr-swis]

7 hours ago, Capt. Hunt said:

Ive noticed this on a few mod parts that are rigged for flags as well, such as the KSO.

Best thing to do is to report this in the mod release thread for the parts you found, and mention the bug report nr. so the author(s) can watch for whatever the resolution of the problem is; or in case it's a systemic issue with the game, they can add additional information to the report itself.

[bewing]

That bug has also specifically been fixed in the new version (prerelease).