[Miller]

From my test I can conclude.

Getting stunned at 7m does not allow you to shake off but instead removes the stun status. Turn is still skipped for some reason.

Getting stunned at 1m while going last has the stun status carry over into the next turn. Proccing shake off on the very same turn you got stunned in this scenario would refund 3m instead of the 1m you lost. Proccing shake off during the next turn refunds 3m on top of your 7 initial starting momentum.

I have not tested 3/4m stuns quite yet but will if I have to.