STR:

1. Have an example folder structure in Mailbox (MH) like:

Parent
Parent/Child1
Parent/Child2
...
Parent/ChildN/...

and put some messages in all folders except Parent.

2. Create a sticky+recursive Extended quick search such as:

message matchcase "something" & ~tag matchcase "ZZZ"

and run it on Parent

3. The folders containing the messages with given parameters get the "magnifier" icon after the search is completed. Suppose Child2 has matches

4. Click to open Child2 folder

5. Select all the filtered messages and apply tag "ZZZ"

6. Click to open Parent folder

EXPECTED:
The "magnifier" icon should be removed from Child2.

ACTUAL:
The "magnifier" icon remains on Child2 although it does not contain matches

7. Click to open Child2 folder

EXPECTED and ACTUAL: same as above.

The only way to have proper update is to clear the filter and reapply it on Parent, i.e. not a "sticky" behavior.