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My public node regularly fails to forward for "CLTV too soon" errors like:
INFO [lightning::ln::channelmanager:1822] Failed to accept/forward incoming HTLC: Outgoing CLTV value is too soon
with some additional logging, it looks like the difference from current height to outgoing CLTV height is usually 14 when this happens, implying, I'd guess, that someone is trying to pay an immediate neighbor of mine, with a final CLTV delta of 14 blocks. I'm really not a fan of reducing our "min difference from now" constant down from 21 blocks but there's no way in the current spec to communicate this - we only have the CLTV delta which gates the inbound HTLC height, the outbound is entirely based on what the receiving node wants.