Outer Planes can get... weird.
One such oddity is extended exposure to a certain plane can actually affect one's alignment and change them physically (if I remember my lore correctly), or activate things in their blood. Hence why there are so many tieflings in BG3 because of Descent into Avernus in which an entire city was exposed to the 9 Hells. I want to say the phenomena is how you can sometimes get Lawful or even Good Demons and how you can get Chaotic Modrons, even though by their nature they should be always a certain alignment by their very existence.
Err, my point is that the rules/lore of the outer planes can sometimes be weird and even contradictory, like how Demons should always be Chaotic and Evil, but there are examples in canon D&D material of Lawful Neutral or even Chaotic Good demons. Though I did not know about subjective time, and kinda just considered true time the multiversal constant.
