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@Pesala I reopened my [Settings > Tabs] tab. There's indeed a general New Tab Position setting, and a Cloned Tab Postion setting:
I agree that the option to make Back-opened tab open to the left should not exist as one more option in the "New Tab Position" selector, but rather as a tick box, named for instance "Tabs opened from the Previous or Rewind buttons should be placed left of the active Tab".
This box could be placed either in the "Tab Handling" column, or in its own special column, which could be named, for instance, "More Tab Position Options", or "History-related Tab Position Options".