Lightning works by having presigned transactions spending the multisig. If you fee bump the funding tx outside your lightning wallet, the transaction will change and those pre signed transactions will no longer be valid, thus locking up the funds.
isnt the fee bumping attempt coming from the single sig side? ive never tried either but ive assumed if i underpaid a channel open the only viable way to add more funds for fees would be cpfp referencing the change back to my side.
Yeah exactly that's the correct way to do it, if you rbf you need to tell your channel peer about it. I'm not sure if every implementation supports that though
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