Interesting! Foundry USA mined a full-rbf double-spend, with a few minutes between tx #1 and tx #2:

My best guess is this has something to do with unconfirmed inputs. My stock v24.0 node saw both tx #1 and tx #2 at the same time initially, but rejected the latter for spending an unconfirmed input. Then a few minutes later, it accepted tx #2 once the input confirmed.

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When you say “double spend” you’re just saying that the outputs on the replacement tx (that was included in a block) were distinct from the outputs in the original?

@ademan Yes.

The link has the raw hex of both transactions if you want to take a look.

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