Disclaimer: there are people on this forum and in this thread that know WAY more about this topic than I do so if they disagree, listen to them.
Hesitant starting and rough idling on a diesel after a possible but not confirmed overheat, a compression check might be in order if you’re concerned about what long term damage may have been done.
And I think I understand what you’re saying about it running well enough to not hear an issue unless you have a pre-incident experience, so I’ll make you an offer in case you want others to listen to it. If you post a video of yours doing whatever it does that’s different from before (starting weird, slight rough idle, etc.), I’ll review the video and take a video of mine replicating whatever you’re doing with yours to the degree practical so the tech types on here can compare. Mine has a bit over 500 hours and runs like it always has. Not asking you to post a video for comparison. Obviously easier for me if you don’t. But if you want to do comparison videos, I’ll do it.