Fabia Injectors: 1.6 TDI - 3 or 4 Failed?

Perhaps someone has experience with something like this: yes.
The car is a long-distance vehicle with 496,000 kilometers on the odometer.
Driving shifts of 500 km per day are acceptable.
CR injectors ejected from the 3- and 4-cylinder engines. Retaining pin broken.
They were cleaned and reinstalled - the engine ran smoothly without any hesitation up to 2000 rpm...
but when I accelerated to 3000 rpm, it popped out again...
Nozzles from Continental.

Similar situation with a Skoda Fabia 1.4 TDI: middle injector came out.
The second car has only been driven 150,000 km.
Does anyone have any idea what might be causing this?