[Workflows] Search on empty relation is giving unexpected results

[StephanieJoly4]

Bug Description

I created a search on a custom object (user workspaces) based on empty relations. (each user workspace has many Twenty users and each user workspace has many Twenty workspaces => this is my intermediate table of my many to many).

When I search based on those relations "is empty", no records where found (whereas I have plenty meeting this condition in my workspace).

When I instead created this search, keeping the record empty, the

2 things happened

1. The search filters were translated as before and
2. I got the 200 records I expected

I think the fact the first version of the search not returning results but the second one returning results is unexpected