Add/set progress for an existing quest from crafttweaker. New 'Function' task type that runs a crafttweaker function to check progress. New 'Function' reward type that runs a crafttweaker funtion on ...

Note: This is possibly a Linux-specific issue, and a very rare one at that. I've asked in r/feedthebeast's Discord but they just suggested to go here, even though I'm pretty sure this will be closed ...