As part of a cleanup in the object filter in 2.20, we have decided to change the default logic from OR to AND in the object filter, the current situation was a bit chaotic where it was not always straight forward to know if OR or AND was applied.
For the most part, this change should be welcome, and now queries like this will work as expected:
Where before it would return BOTH those who had that parent id and those who where part of that group, now it will return only the results where both conditions are true.
This also means that this no longer work:
But this can be replaced with the new IN operator in 2.19: