Stopping playback selects the clip under the timeline marker, making working with in/out markers painful
Since a couple of releases ago, stopping playback has started selecting whatever clip is under the timeline marker. This is incredibly frustrating when working with in/out markers, because if you begin playback, press [I] to set an in, press [O] to set an out, press [space] to stop playback & then [#] to perform a ripper delete of your in/out section... instead the entire clip is ripper deleted because the action of stopping playback now selects the entire clip. Performing ripper deletes on in/out sections is such basic/common functionality that this is incredibly annoying!

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Andrew commented
Turn off "Selection follows playhead" in the sequence menu. It gets saved with the workspace, so you will need to turn it off, then save your workspace