So, I know the method in which I got this error is VERY OBVIOUSLY UNSUPPORTED

but I said screw it and patched the mod.json file to run on 1.19.4 and... well...
this is it without the patch (and log)

https://mclo.gs/4AW8SsI

and with the "patch"

https://mclo.gs/Ko3biRC

By far, the weirdest non-crash issue with a mod being forced to run on 1.19.4 when it only supports 1.19.3

oh, and with the "patch" the "search items" tab is just *empty"

Sorry for the late reply, but at this point 1.19.x wont be officially supported anymore.