You haven't said which simulator you use.
Since 2019, when we released the PBR update for P3D V4, we added a completely new ( and way easier ) system that uses DirectX 11 to add custom textures for operator logos, which made the old PaintKit we used to have for FSX and older P3D versions obsolete.
The DirectX 11 method is not supported in P3D V5 and we explained many times we are not going to try supporting DirectX 12, because we saw all the issues even LM themselves were having with VRAM, stability, etc. In addition to that, we relied on some DX11-specific support libraries that required parts of DirectX that has been removed from DX12 ( like DirectWrite for Font support ) and since this hasn't been updated to support DX12, it would make porting our code too complex and not commercially viable.
Until today, P3D V5 didn't support any logo, the vehicles were all generic but, with the 2.9.4 update, we restored them using the more standard Multi-liveries method, like the one used in FSX, just updated for PBR objects. This method is surely 100% reliable ( any livery in the sim is made like that ), but it lacks flexibility and, due to the large number of object combinations in GSX, it will make very complex adding new operators.
But, at least, you are now getting 200+ operator liveries in P3D V5, instead of none as if was before the update.