Problem
as the title say, i select some uv islands and if i confirm the selection and than try to select some other it reset the selection and i have to select them all again plus the one i want to add in addition to the previous.
actual work around
add more uv shell mask, not so much practical most of the time, same in case there is a selection number limit.
hope
it’ll going to work as the mesh mask; no limit, no reset.