When trying to overwrite recipes in an addon, the 6 standard wooden trapdoor recipe identifiers are unknown. They are not included in the Vanilla Behavior Pack, Recipe folder. 

The crafting recipes for Iron, Crimson, and Warped trapdoors are in the behavior pack and can be overwritten as expected.

What Happens:

Various attempts at determining the recipe IDs fail, using permutations the likes of of: trapdoor, trap_door, [wood type], [woodtype]_trapdoor, [woodtype]trapdoor, trapdoor[woodtype], and many other permutations with various logical placement or omission of underscore(s). Using the naming convention of the included trapdoors and replacing their types with the standard wood types does not work either. I've also tried it case-sensitive, and included a "_recipeId" found on the end of some old/original recipes, all with no luck.

When establishing any of these wood-type trapdoor recipes, the "two rows of 3 planks" recipe still produces a trapdoor.

What I Expect to Happen:

1) the Vanilla Behavior Pack Recipe folder should include all trapdoor recipes, considering it does contain a portion of them, or...

2) using the same naming conventions as the included trapdoor recipes, creating a new recipe for one of the 6 pre-1.16 wood-type trapdoors should overwrite the existing trapdoor recipe, and "two rows of 3 planks" no longer crafts its associated trapdoor.

Additional Information:

Other recipes seem to be missing from the official pack, as well, including Stone Brick crafting table and stonecutter recipes, Cracked Stone Brick furnace recipe,