In Jira Cloud (we just migrated to Jira Cloud from Jira DC about a month ago), I'm getting an error when I try to filter on project for a plan I just created. As soon as I check the project I get the error "Something's Gone Wrong..." there is also Error: VH94PX
Something with that particular project and/or board may be causing the issue but I am unable to determine what that is. I can create new plans from other boards and filter them as well as filter existing plans created from other boards.
Thank you, @Chris Francuz
I created a support ticket for this error since all users attempting this are consistently getting the error.