Things seem to have calmed down, issue-wise, with the checkout thing.
One time we headed to the second resort before official checkout time, and had issues with checkin. No biggie, we had things to do so we came back later after official checkout time and all was well.
Since you’re heading to a park and not the next resort, the issue I had wouldn’t apply to you.
Having issues with checkin and checkout isn’t a feature; it’s a glitche. Glitches can happen any time and they can be fixed if they happen.