sandbox issue: syscall=324 is blocked

On my system

$ xuname
Void 5.16.18_1 x86_64-musl GenuineIntel uptodate rrnDDFFFFFF
$ zathura --version
zathura 0.4.9
girara 0.3.7 (runtime: 0.3.7)
(plugin) pdf-mupdf (0.3.7) (/usr/lib64/zathura/libpdf-mupdf.so)
(plugin) ps (0.2.7) (/usr/lib64/zathura/libps.so)
(plugin) djvu (0.2.9) (/usr/lib64/zathura/libdjvu.so)

under Wayland (compositor is river) the strict sandbox config option does not work: audit: type=1326 audit(1649938688.774:4): auid=1000 uid=1000 gid=1000 ses=1 pid=21759 comm="zathura" exe="/usr/bin/zathura" sig=31 arch=c000003e syscall=324 compat=0 ip=0x7f12ee42ba7c code=0x0