They will.
They're designed for that.
If you don't believe me, fit one and then try to remove it.
Follow the instructions for fitting (simpson strongtie have them online) and use square twisted nails, although I have seen them fitted with normal nails and screws and they don't move, unless there's a leak and the wood rots.
I feel a bit silly for putting the 2x2 half way up the plumb cut now. But I’m telling myself I’ve invented something that would at least allow the very edge of the plasterboard to be supported
Oh, if we're engineering to that extent (like.. making a proper job of it as if it's our ownnhouse rather than the customer's) let's run a 3x2 ledger through a table saw tilted to the angle of the ceiling..
(I won't tell anyone that a well placed screw line into the corner of the ledger would be fine for edge support..
As would using the wall PB to support the ceiling..
ps; I'd do a 2/3rds 1/3rd rule for the ledger support fixings
)
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