I'm pretty excited about the new Forms Designer for on-prem. Something I just noticed while trying to convert a process from the old to new designer is that the saved version of the form doesn't seem to respect field rules. I have some things set to always hide that are, in fact, showing up on the saved form. I also have some things that are a little more dynamic (show a warning if two fields don't match) that also are not being evaluated upon save.
Is this a known issue? Will it be fixed?