Should collapsing a parent tab change tab focus from child to parent?

[azizLIGHT]

If this is the tab structure
├─ Parent Tab
│ ├─ Child Tab1
│ └─ Child Tab2
and you are focused and activated on child tab 2
and parent tab is unfocused and also discard/unloaded
then should collapsing the tree using the arrow on parent tab cause focus change to the parent tab, and incur a page load of parent tab?

or without the unloaded/loaded status, should the parent tab become focused regardless?
should a focus change happen from child to parent when not directly asked for by clicking the parent tab?

if the focus change shouldnt happen, then how would you deal with the "invisible" child tab being activated and focused but not appearing in the tree, since its been collapsed under the parent