Playing on Manjaro Linux 5.15.38-1-MANJARO using X11 and KDE Plasma 5.24.5
Error [25May2022 23:58:46.309] [Render thread/ERROR] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: Exception caught during firing event: Cannot read field "uploadMode" because "net.creeperhost.blockshot.Config.INSTANCE" is null is thrown and client immediately crashes.
Log below:
latest.log
EDIT: ran a quick cat latest.log | grep "ERROR" > errors.txt for you, so you don't have to comb through thousands of lines of log output:
errors.txt

In case someone needs a temporary fix. Deleting the file blockshot.json in the instance folder (aka. where you can find instance.json and options.txt) or alternatively, ensure that it looks something like this

{
  "uploadMode": 1,
  "anonymous": true
}

fixes the problem. For some reason it seems that I've ended up with a blank file, causing the issues mentioned above.

This should be fixed in later builds of the mod