[BUG] Modprobe not found

Hey Resiners,
I’m having some troubles understanding why I get these kind of errors:
with CMD ["modprobe", "some-module"]

/etc/resinApp.sh: line 2: exec: modprobe: not found

or even with CMD modprobe some-module

/bin/sh: 1: modprobe: not found

Everything was working fine on resin/rpi-raspbien:stretch, but when I switched to resin/rpi-raspbian:buster to get some package updates I really need, these errors appeared…

Any clues ?