Have a filter applied to a feature layer (hosted) in AGOL. Built a filter, not crazy but has a few sets of conditions. Map data appears to be respecting the filter, based on expected # records.
However when I go to edit the filter, it's not showing up in the dialog box, either in the 'View' or 'Edit' tab - both seem to indicated no filter is present, the only difference is that in the 'Edit' tab, it does show the first 'dummy' expression waiting for you as it does when you create a new filter.
Seems very much like a bug, but wondering if anyone else has seen this behavior.