This has been posted for quite some time. I guess it is just not important enough for Blizzard to fix.
No, smaller/certain weapons (like your “lightsabers”) don’t do it. I found this “wrench thing” look, which went with this mog; Happily it doesn’t do that “Face Hider” thing.
Look at my date, of this post (in the web bug forum)
March 2019.