Lightzone 5.0 Beta 2 now uses a modified DCRaw/LibRaw (similar to Darktable). When DCRaw ended in about 2018, Lightzone could no longer add new cameras. The solution was/is to add LibRaw that does allow newer cameras to be added. You can find the installation instructions → HERE.
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unable to install with AUR due to javahelp2 error
EDIT: I think I found out that AUR is Archlinux by seeing this thread HERE. It seems that they are using java-21-openjdk. Can you install that version of Java and try again?