MPM switching from prefork to event after plesk repair all -y

Hi at all,
two day ago I made plesk repair all -y (usually for testing I use -n).
After finishing I looked in PHP settings and also in Apache settings and was surprised to see that MPM had changed from prefork to event.
This is a reproduction without realizing it.
because during the last weeks by configuring FPM settings and a little more services I wondered why sometimes MPM changed. by configuring several things I didn't find out why it changed. No it's obvious.

greets