@super_testnet appears to be responsible. On Twitter:
Yeah it was me
I thought it would crash inscription employers because the transaction has no ordinal number to assign the inscription to -- it pays no fee and has no output value
No such luck, though. Somehow the explorer decided to assign it to an ordinal in the coinbase utxo.
Also:
A friend of mine knows the cofounder of f2pool so he emailed the commit tx and the reveal tx to them directly, and they agreed to include them in their next block