Customize Engine Mode: "Cancel" test filter builder appears to persist it.

v2.9.0.8

1) I have a non trivial engine mode filter in "Automatic Test Filter" set up
2) I have a condition "Only in project with name: ABC"
3) I change it to be "Not in project with name:", which removes "ABC" (would appreciate if it didn't).
4) I now want to cancel change since I need to copy the ABC project name, so I click "Cancel" in Test Filter Builder, but the change seems to be persisted in the "Customise Engine Modes" and if I change filter again it seems to have persisted my canceled change.
5) I Cancel main "Customise Engine Mode" and reopen it, now my original filter is back.

Expected Cancel in "Test Filter Builder" to behave as I cancelled it when going back to "Customise Engine Modes".

Thanks for sharing this. This doesn't sound like behaviour as designed. I'll take a look at it and will see if I can improve the experience here :)