There are a few surprises even in the chaotic areas.
There is a nice video on this:
https://youtu.be/OIHyN7TzY6A?si=TbftDs6P_HdYfVea
It can be nicely re-created with your code. Thanks a lot.
t=17
t=100
So even after 100 s, there is a small patch in the highly non-linear regime, where the pendulum can be predicted very accurately.