@Louis, we isolated the issue. It is not a bug per se, more of a usability consideration.
Effectively, when setting the Per View setting, somehow the Tablet breakpoint was set to 0 instead of 1.
While it may be a temporary lack of imagination on my part, I can’t at this moment think of any good use case for having less than 1, so perhaps this can be validated in the UI to 1 or more to prevent this from occurring?
If there is a good reason not to do that, then this bug can be moved to General, as the original issue as stated is resolved.
Randomly (with some unknown trigger/cause), the tablet breakpoint will display 2 slides instead of 1, even though it is supposed to inherit the value of 1 from the desktop breakpoint.
Explicitly setting the value to 1 resolves the issue, but it is definitely something worth investigating.