It’s only one pipeline, there’s no “local editing” concept per se. There are different tools, in different positions in the pipeline, and some of them support masks. They are grouped together in the UI, but that’s it.
Will the mask also be changed when I adjust global exposure, white balance or HSL Equalizer while already having a mask curve adjusted?
those three tools come before any local editing, so yes, they will change the masks. The rule of thumb is global edits first, local edits at the end. Of course that’s not always possible, but then you have to be prepared to tweak the masks.
Thanks for reporting, and don’t assume these are known bugs They might be, but that’s not the norm. On any case, it’s better to report twice than never… and yes, if possible I’d prefer bug reports in the bug tracker, thanks!