Filter broken after contained project has been deleted

Migrated from Jira 3.12.2 to Jira 4.1.1, then deleted some projects. Then got the following from an (admin) user:
I have filters on my Dashboard that show my Opened, In Progress, and Approved issues. Those filters are showing me the following error:
There are problems with the current configuration for this gadget. The errors below may have been caused by the deletion of entities required by the gadget or by changes to your permissions.
• The selected filter filter-13405 has an error: The value 'PMOR' does not exist for the field 'project'..
• The selected filter filter-13405 has an error: The value 'XPR' does not exist for the field 'project'..
I get the same error for filters 13450 and 13451. When I try to fix then (delete the projects that give an error) I get this error:
The selected filter The selected filter

has an error:

. has an error: filter-13405.

i.e. the filter cannot be fixed by removing the reference to the deleted projects.