OS: Ubuntu 24.04

I have searched this for a while and seems i can’t get my search terms right.

Back when ifuo/down system worked custom scripts were put under ‘/etc/network/if-up.d’ etc. Now ubuntu uses netplan. But where to put custom script? That would handle tc rules in my case. /etc/networkd-dispatcher/routable.d was told by internet but that just trows error during boot; ERROR:Unknown state for interface.