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If it is a closed channel shouldn't you have the option to send it via on-chain?

Yep, but it apparently went to a different wallet derivation, as the FC should go to a taproot address, not a native segwit one. Still trying to figure out why that happened.

Also, what is the methodology for some of these wallet closing channels?

I think Blixt is pretty much using LND "rules". As for Breez, not sure, but I guess they are using Greenlight/Core Lightning [1] as of today.

  1. https://blog.blockstream.com/lightning-platform-breez-to-integrate-greenlight-to-build-non-custodial-lightning-apps