Circuit Troubleshooting - Disposal/Dishwasher

TL;DR: Disposal stopped working, wire hot to the outlet. Switched out the outlet, now no hot to the outlet and dishwasher (separate outlet and breaker) is now without power.

So of course this happens 2 weeks after we finished a full kitchen remodel, and I'm dreading the possibility of invasive electrical repair, so figured I'd ask to see if there are any tips before an electrician comes out:

Disposal turned on during dinner cleanup the other night just fine, ran for about 3 seconds, then died. I flipped the switch on and off several times, nothing. Checked the breaker, it's good. Crawl under the sink and test the incoming hot from the switch, it's reading hot, so figured a quick GFI swap and I should be good to go.

Spliced some new wires to give me some slack, swapped out the GFI, no issue. Flip the switch to test, nothing. Incoming hot is no longer hot. Then I look over and notice the lights on the dishwasher are not on. The weird thing is I didn't mess with that outlet at all, can't even see it. It's also on it's own dedicated breaker, which was not tripped.

Does anyone have any idea how I can go about troubleshooting this issue? The other switch in the same box as the disposal is still turning the light on/off just fine, and I'm kind of at a loss.

Any insight or tips/tricks would be greatly appreciated, because I'm almost to the point that I want to run new wire for independent dishwasher/disposal from the basement panel spares!