Found something similar with the F6F in beta 21. My reskinned example initially appeared almost transparent except for a haze of rgb dots on alternate panels. I tried a FW190 which was OK, but then when I retried the Hellcat it had the FW art draped over it. The original AH F6F art displays OK.
Just in case, I double checked the art was 1024/256 and also tried clearing the cache.