Did you just rebuild it as-is?
In my case I pulled from the existing PR for minimal 6.3 support as seen in the Unstable thread;
https://forum.manjaro.org/t/unstable-update-february-2025/173706/17?u=cscs
Also removed klassy-qt5 as unneeded for me. 
EDIT.
Oh. I see, the PKGBUILD was updated to include a patch from that PR. Carry on. 