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2024 PT5 can be added as well, the reason for it not being included on the PHA database looks like the same as 2024 YR4. It has/had a peculiar orbit, though. All SpaceEngine can do currently is to show simple Keplerian elements orbit, unperturbed by gravitational pulls of other bodies. So if you want to see how its orbit was changed in the past by passing near Earth, I'm afraid you won't be able to with SE right now. With a bit of work it could probably be possible to create a path in a scenario script file. Actually it's one of many things I tested in the past, just couldn't dedicate more time to it. I know there are people using that for their video needs, I definitely have to go back to it.
But here's a thing that I find interesting with JPL definition of potentially hazardous asteroids (PHA): 2024 YR4 is certainly hazardous, but it's not included in this database group by JPL because its absolute magnitude is fainter than 22, which roughly translates in a diameter of less than 140 m. I guess they go with a stricter definition considering potential damages if Earth is hit.
Just to be clear in case you wonder, I'm not picking asteroids by hand and checking their orbits manually, I have software basically processing the database when I launch a few commands.
Now, The fact that 2024 YR4 is not included in that list seems a bit weird, isn't it?
That's why, instead of adding a specific exception for the asteroid, which is not the best way to go with programming, I'll probably expand the program to use custom filters instead of being stuck by JPL's definitions.