Hello,
People have been getting a lot of issues like this on Hexcasting: https://pastebin.com/Bbb3GWib
io.github.fablabsmc.fablabs.api.fiber.v1.exception.FiberConversionException: Invalid serialized value 0
The rub here is that, in the hexcasting-client.json5 config, it is set to 0.5.
Is this an issue on my side? Here's the line where it's crashing in Hexcasting. (Note there's a Mth.clamp that should fix up issues where Fiber successfully loads a 0 value.)