Hi, nop, i couldn´t solve the problem using WP 5.0. The only way is to install the Classic Editor plugin, so guttemberg editor will be disabled.
When guttemberg is enabled, pages, posts, etc, having custom groups/fields, do not save the changes when pressing “publish”. The new content on those fields do not disappear, but if i leave editor and return, no changes saved.
I guess is something when guttember saves data (js), well, it´s not saving for some reason, thats´s the problem.
