Is jpeg-xl blacklisted from s390x ?

[cc me please]

Dear s390 porters,

Could someone please confirm if there is anything wrong with the
jpeg-xl package. For some reason it is not built on s390x:

* https://buildd.debian.org/status/package.php?p=jpeg-xl

[...]
Buildd exposure stats s390x 0.7.0-9 Needs-Build 5d 22h 5m uncompiled
misc old | no log giveback
[...]

Thanks,