1) Changes are not shown during the gradient's editing. 2) Changes are not shown after the finishing gradient's adjustment. 3) You need to swap between gradients to see changes. 4) Masking effect works wrong (see attachments). 5) Undo (Ctrl+Z) causes loss of the previously adjusted gradient in any time.
Attachments is too big, see —> https://youtu.be/gD1hrU0aimc
Same problem. Files with gradient maps also seem to get corrupted.
I fixed this in master :) I will therefore close this, if you can reproduce this bug in 4.0, please don't hesitate to reopen this bug. :)