Update: F2Pool included their first P2TR spend (https://mempool.space/tx/414ef7844f2b295a4d24ccff015937c290a0ffcd1a27fcc4175e84416c8b1cba) today in block 710269.
F2Pool reached out, and we debugged the issue: Nodes are up-to-date but didn't have any >=v0.21.1 peers (due to custom patches and addnode) that relayed P2TR spends. That's fixed now. https://twitter.com/0xB10C/status/1460033874428317696
Bitcoin Maston Instance