Musixmatch can not run under firejail

[GreatBigWhiteWorld]

Any idea what's the problem for musixmatch here?
firejail version 0.9.66

firejail /opt/Musixmatch/musixmatch %U
Reading profile /etc/firejail/musixmatch.profile
Reading profile /etc/firejail/disable-common.inc
Reading profile /etc/firejail/disable-devel.inc
Reading profile /etc/firejail/disable-exec.inc
Reading profile /etc/firejail/disable-passwdmgr.inc
Reading profile /etc/firejail/disable-programs.inc
Reading profile /etc/firejail/disable-xdg.inc
Parent pid 23668, child pid 23669
Warning fcopy: skipping /etc/alternatives/libjavaplugin.so.x86_64, cannot find inode
Warning: skipping asound.conf for private /etc
Warning: skipping crypto-policies for private /etc
Private /etc installed in 9.20 ms
Private /usr/etc installed in 0.00 ms
Warning: not remounting /run/user/1000/gvfs
Child process initialized in 523.84 ms
Check failed: sys_chroot("/proc/self/fdinfo/") == 0

Parent is shutting down, bye...

[rusty-snake]

Check failed: sys_chroot("/proc/self/fdinfo/") == 0

seccomp -> seccomp !chroot

Maybe more: ignore caps.drop all ignore nonewprivs ignore noroot ignore protocol ignore seccomp

[GreatBigWhiteWorld]

Check failed: sys_chroot("/proc/self/fdinfo/") == 0

seccomp -> seccomp !chroot

Maybe more: ignore caps.drop all ignore nonewprivs ignore noroot ignore protocol ignore seccomp

Hey, just 'seccomp !chroot' is good enough! Many thanks !
Not sure why it needs chroot though.