The issue with the characters losing textures is fixed 100%, however there’s another issue that’s presenting itself with the .obj exporter.
As @Astrollect experienced, any part with a Roblox texture is exported seemingly without color and instead now with the Roblox material’s diffuse texture, though this isn’t completely the case.
To fix this in Blender specifically, disconnect the image texture input attached to the Principled BSDF shader. Unlike the character issue from before, it retains color, so this can be dealt with as usual. (Since Roblox textures didn’t export previously, most people would then use a node by Maplestick to re-texture models for rendering within Blender)
Colored boat below has had said texture node disconnected - right model is straight out of Studio and now a mix of Roblox textures and a new texture I’ve inserted on the right. Seems to be different types of studs.
The issue also comes up when anything with a decal texture is exported. It retains color data, however is now exported without the appropriate decals but instead the stud texture.
Studio View
Of course it’s not impossible to manually go in and find decal textures to fix for small models like this and texture them oneself, but when artists need to work in external software with large scenes, this is a massive pain and adds unnecessary amounts of time to fixing an issue that hasn’t occurred up until now.
I’m much more experienced in Blender than I am in Studio, but I’m hoping this helps and again, is fixed soon.