What about when the force close transaction has no anchor outputs (don't ask my why it doesn't, i have not idea), so bumpclosefee cannot CPFP it? Is accelerating the transaction the only way?
You can check which commit method your channel has with lncli pendingchannels. But as mentioned in 7), if commit=static, then you don't have anchors, and then yes, unfortunately, only two options remain:
  • wait for your peer, who has a receiving output of the tx they could CPFP
  • go out of band and accelerate the tx
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