Segfault running `xwfb-run` with `cage`

Trying to run xwfb-run with cage compositor for alexandria package in Fedora, I observe this segfault:

(EE) 
(EE) Backtrace:
(EE) 0: Xwayland (0x555555554000+0x16a092) [0x5555556be092]
(EE) 1: Xwayland (0x555555554000+0x16a195) [0x5555556be195]
(EE) 2: /lib64/libc.so.6 (0x7ffff740e000+0x40dc0) [0x7ffff744edc0]
(EE) 3: Xwayland (0x555555554000+0x932d4) [0x5555555e72d4]
(EE) 4: Xwayland (0x555555554000+0x3ac5a) [0x55555558ec5a]
(EE) 5: /lib64/libffi.so.8 (0x7ffff7b21000+0x9056) [0x7ffff7b2a056]
(EE) 6: /lib64/libffi.so.8 (0x7ffff7b21000+0x568d) [0x7ffff7b2668d]
(EE) 7: /lib64/libffi.so.8 (ffi_call+0x12e) [0x7ffff7b294de]
(EE) 8: /lib64/libwayland-client.so.0 (0x7ffff7e65000+0x510e) [0x7ffff7e6a10e]
(EE) 9: /lib64/libwayland-client.so.0 (0x7ffff7e65000+0x5979) [0x7ffff7e6a979]
(EE) 10: /lib64/libwayland-client.so.0 (wl_display_dispatch_queue_pending+0x73) [0x7ffff7e6ad73]
(EE) 11: Xwayland (0x555555554000+0x2f3a3) [0x5555555833a3]
(EE) 12: Xwayland (0x555555554000+0x16f2e4) [0x5555556c32e4]
(EE) 13: Xwayland (0x555555554000+0xa0590) [0x5555555f4590]
(EE) 14: Xwayland (0x555555554000+0x20b46) [0x555555574b46]
(EE) 15: /lib64/libc.so.6 (0x7ffff740e000+0x2a248) [0x7ffff7438248]
(EE) 16: /lib64/libc.so.6 (__libc_start_main+0x8b) [0x7ffff743830b]
(EE) 17: Xwayland (0x555555554000+0x22525) [0x555555576525]
(EE) 
(EE) Segmentation fault at address 0xa0
(EE) 
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting
(EE) 

While I was trying something such as $ gdb --args python3 which xwfb-run --compositor cage -e /dev/stdout -- rake spec:unit, I did not have luck to get deeper.

I realize this might be wrong tracker, but I also don't know where else to report this. Sorry.