Bug reports for applications go to http://github.com/KaOSx/apps/issues. Though this is a KaOS theme specific issue, so you can also open at https://github.com/KaOSx/midna/issues.
Discussing in the forum goes under Technical/Applications, already retagged for you.
That said, issue is found:
https://github.com/KaOSx/midna/blob/master/sddm/midna/Main.qml#L233
It has an extra M
, should be just 4 not 5.
You can check that yourself, edit that file at line 233 and remove the extra M
:
kate /usr/share/sddm/themes/midna/Main.qml
Then test the greeter with:
sddm-greeter --test-mode --theme /usr/share/sddm/themes/midna
Rebuild midna will be up later today.