I created a custom set and defined the Obtain method as "By Quest".
If I now edit it again the method is reseted to "By Killing".
If I then switch it again to "By Quest" all values are cleared.

Could you please take a look?

Thanks.

Seems to be reproducable only some of the time.

I've made some changes as to how the entire edit custom sets work, so this issue should be irrelevant come next update.

Please reopen the issue if the bug reoccurs.

Curseforge is currently down, so I can't upload the recent update. I will update it as soon as Curseforge is back up.