Thanks for the replies:
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I did not cut the chain or install it, it was done at the shop at the beginning of the season during regular pre-season check-up. It is installed correctly at least in terms of reverse side/front side.
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yes Im aware of the limit screws function. I should have been more clear; I have done a « reset » on the rear derailleur (tension out; reset limits; tension in; indexing) and have achieved only moderate success (two cogs consistently rub, while the rest do not).
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the shifting itself is crisp. The issue is the rub between the chain and the next cog down. While I cannot at the moment (on vacation) it is ultimately my intention if the issue persists or no other solution prevails to bring the bike for a full inspection at my local shop.
At this point, the most likely issue seems to be the cassette being worn (I had considered this, but its too easy in my experience to throw money at a bike to « fix » something and end up with new parts and the same problem).
When I consulted the shimano user manual, I did notice this:
Does « use with single front chain rings » mean specifically 1x?
I appreciate the help. I’m really not a great mechanic, so the input is super well received.