It may be, these transmissions have like 40 different shift maps and an inclinometer so if it thinks you're going to get back on it it may not upshift

 

Welcome!
I suspect that the truck thinks since you just goosed it that you may need it to hold the gear for rapid acceleration again rather than getting a demand for another downshift while it's trying to upshift. Self preservation. Also, you haven't had the truck long so it may still be sorting out your driving style.

I don't have the issue in my Ram, but in Ford Interceptor suv and sedans I've had the transmission hold a low gear for about 5 seconds after a quick acceleration and letting off the gas to go around a corner.

 

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reading your description,, I think that behavior is 'normal' for the 8-spd.

if you 'back-out' of the throttle more gradually it should upshift more 'normally'
(but you'll still be accelerating )

there are a number of 'different' and/or annoying 'features' of the trans programming for our 8-spd's ...

particularly aggravating is when it 'holds' 1st or 2nd gear up to 4,000 rpm before shifting when the truck is cold and/or going down a decline..
similarly, climbing an 3-5% incline, it will refuse to upshift until nearly 4,000 rpm ..

I have learned to 'prompt' an upshift by backing out of the throttle slightly - works sometimes...
similarly, anticipating passing someone, if you back out of the throttle then tip back in quickly, it will usually prompt a 1 gear (or two) downshift ..