How are keys for lightning channels currently created?

How are keys for lightning channels currently created?

Keys for creating lightning channels seem to be derived differently than in usual bitcoin wallets. Lightning node data corruption, despite backup of master seed phrase, seems to prevent recovery of channel keys. How are channel keys currently derived, and why is recovering these keys with a corrupted node extremely difficult?

This question is in response to #3 of the following video (timestamped) https://www.youtube.com/watch?v=5fMv8MpzLgQ&feature=youtu.be&t=143

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