datafixer error explosion "failed to read field grass_path"

Stack trace

[06:22:24] [Paper Common Worker #3/ERROR]: Failed to read field (pool_element={element_type:"minecraft:legacy_single_pool_element",location:"minecraft:village/taiga/streets/crossroad_04",processors:{processors:[{processor_type:"minecraft:rule",rules:[{input_predicate:{block:"minecraft:grass_path",predicate_type:"minecraft:block_match"},location_predicate:{block:"minecraft:water",predicate_type:"minecraft:block_match"},output_state:{Name:"minecraft:spruce_planks"}},{input_predicate:{block:"minecraft:grass_path",predicate_type:"minecraft:random_block_match",probability:0.2f},location_predicate:{predicate_type:"minecraft:always_true"},output_state:{Name:"minecraft:grass_block",Properties:{snowy:"false"}}},{input_predicate:{block:"minecraft:grass_block",predicate_type:"minecraft:block_match"},location_predicate:{block:"minecraft:water",predicate_type:"minecraft:block_match"},output_state:{Name:"minecraft:water",Properties:{level:"0"}}},{input_predicate:{block:"minecraft:dirt",predicate_type:"minecraft:block_match"},location_predicate:{block:"minecraft:water",predicate_type:"minecraft:block_match"},output_state:{Name:"minecraft:water",Properties:{level:"0"}}}]}]},projection:"terrain_matching"}): Unknown registry key in ResourceKey[minecraft:root / minecraft:block]: minecraft:grass_path; Unknown registry key in ResourceKey[minecraft:root / minecraft:block]: minecraft:grass_path

full:
https://pastebin.com/raw/YbBaKnHP

Plugin and Datapack List

no datapacks, a few N/A plugins

Actions to reproduce (if known)

no clue

Paper version

29c8822d90899c89d2689338e81a98f690bcba12

Other

No response

Start with the reported DataFixer stack trace and the full paste linked in the issue, focusing on the missing minecraft:grass_path registry key. There is no known reproduction, so first establish when the village/taiga structure data is read and whether the error can be reproduced on the reported Paper version. Done means identifying the cause and confirming the error no longer occurs in that scenario.