Probably same as: Timing Problems with "Calls"
from which: https://source.puri.sm/Librem5/calls/-/issues/195 and https://source.puri.sm/Librem5/feedbackd/-/issues/10 (the latter of which suggests that the vibration might be a different bug!).
It goes without saying that you need to specify whether you are running amber or byzantium. If you have chosen amber then you have chosen stability as being higher priority than getting bugfixes ASAP, as I understand it.