Builds fine using meson-0.43, starting with meson-0.44.0 however, fails wrt po/ directory somewhere:

[3/5] /usr/bin/python3 /usr/bin/meson --internal msgfmthelper ../data/org.freedesktop.appstream.cli.metainfo.xml data/org.freedesktop.appstream.cli.metainfo.xml xml /home/rdieter/SCM/github.com/appstream/po --datadirs=/home/rdieter/SCM/github.com/appstream/data/
FAILED: data/org.freedesktop.appstream.cli.metainfo.xml
/usr/bin/python3 /usr/bin/meson --internal msgfmthelper ../data/org.freedesktop.appstream.cli.metainfo.xml data/org.freedesktop.appstream.cli.metainfo.xml xml /home/rdieter/SCM/github.com/appstream/po --datadirs=/home/rdieter/SCM/github.com/appstream/data/
msgfmt: error while opening "/home/rdieter/SCM/github.com/appstream/po/zh_TW.po/noc.po/ncs.po/nca.po/nja.po/nsl.po/neu.po/npl.po/nen_GB.po/nfi.po/npt.po/nhu.po/nlt.po/nckb.po/nnl.po/nda.po/ngl.po/nko.po/nuk.po/ngd.po/nes.po/nar.po/nsr@latin.po/nnb_NO.po/nsk.po/nid.po/ntr.po/nit.po/nsv.po/nru.po/nfr.po/npt_BR.po/nde.po/nzh_CN.po/nsr.po" for reading: Not a directory

Or is this a meson bug/regression?