Flycast Vulcan - Missing Graphics in Soulcalibur

Hi, I’ve noticed that if I use the Vulcan back end then I get the following graphical errors with SoulCalibur.

No menus showing. They are there and selectable but I cannot see the text. No character portraits on the character select screen. No power bar in game. No hair on several characters, notably Ivy and Hwang.

I have an Intel Iris Plus 655 GPU running up to date drivers and the latest version of the Flycast core. These errors are not present using OpenGL.

Thanks