AnvilCraft version 1.21.1-1.6.0+snapshot.2145
TMRV version 0.9.0+mc.21.1
This error appears to manifest in the "Block Sequence Processing" category. The "Ancient Sea Reef" item is an example, but the mod also adds a recipe for vanilla Netherite Blocks so it doesn't seem to only manifest on items from AnvilCraft.
Logs: https://mclo.gs/AFk4khP (only EMI, TMRV, and AnvilCraft were actually enabled)
Configs should be default; I haven't edited them.

AnvilCraft version 1.21.1-1.6.0+snapshot.2145
TMRV version 0.9.0+mc.21.1
This error appears to manifest in the "Block Sequence Processing" category. The "Ancient Sea Reef" item is an example, but the mod also adds a recipe for vanilla Netherite Blocks so it doesn't seem to only manifest on items from AnvilCraft.
Logs: https://mclo.gs/AFk4khP (only EMI, TMRV, and AnvilCraft were actually enabled)
Configs should be default; I haven't edited them.