Earthworm Jim 2 VC isn't working anymore except on OGL

[drhycodan]

I know this regression is very recent, because I remember playing EWJ 2 with the Vulkan backend not too long ago, right after XFB was implemented in fact.  It was when XFB was just implemented in Vulkan and Vulkan still had vsync problems (unable to enable vsync even when it's checked).  What's weird is OpenGL has no problem whatsoever with booting this game up, while all the other backends just crash with a black screen.  Can someone take a look at what's special about this VC title and only OGL is capable of running it now (every backend used to play this title no problem)?