xwayland 22.214.171.1241 prerelease - broken with vulkan renderer from wlroots
wlroots equivalent issue: wlroots/wlroots#3569 (closed)
i can reproduce this myself, and reverting the entire dmabuf v4 support from !818 (merged) on the 126.96.36.1991 tag does fix it (just to confirm).
essentially, starting a wlroots compositor with
WLR_RENDERER=vulkan (0.16.1 requires validation layers for it, master doesn't), then launching anything via xwayland on 23 hangs forever, e.g.
i'm not sure who's issue this really is, or how to debug it further, so some pointers would be nice. all i can say is that vulkan wlroots paired with xwayland 23 doesn't work.