Collection sort error

An image can be 'deemed to have' a certain keyword (for purposes of searching or filtering, also exporting) even without that keyword being explicitly and directly assigned, in several circumstances:

• A keyword that it does have assigned possesses this other keyword as a synonym
• A keyword that it does have assigned possesses this other keyword as a parent
• If "contains" is used rather than "contains words", and some longer keyword that is assigned, or a synonym or a parent of that, includes this same string of characters within it.

Thus, if I've assigned a keyword "yellow" and add a synonym "amber" to that, a search on "amber" will find that photo (and also it will include in export) even though it does not have any "amber" keyword directly assigned, and even though I did not search on "yellow". This despite "amber" not even showing in the keywords list.

Similarly for parent keywords. There are keyword options on whether any parents should, or should not, auto-include for export. But they operate regardless "as if assigned" (implicitly) for searching and filtering. Dragging the child keyword out of that nesting, would cease this relationship with the former parent keyword - unless that keyword was also explicitly assigned in its own right.