Mangrove tree placement runs two block_predicate_filter checks for each placement, which is redundant as if the first one passes the second one will be guaranteed to pass.

The Mangrove Swamp biome references the trees_mangrove placed feature, which does the usual stuff with tree placement (increase count, randomize placement in chunk, adjust to heightmap, check for biome), but it also runs a block_predicate_filter to check that a Mangrove Propagule can survive at the given location. This placed feature then references the mangrove_vegetation configured feature, which chooses to either place the mangrove_checked or tall_mangrove_checked placed feature. Both of these placed features run their own block_predicate_filter to check that a Mangrove Propagule can survive at that location for no reason.

Attached are the JSON files for all of the referenced configured and placed features, taken directly from 1.19.4's jar file.