The new dark oak boat item texture in the file name is called "boat_dark_oak", when it is supposed to be "boat_darkoak". This causes the new texture to be unused and not visible when playing in-game.
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This has been fixed in 1.18.20.25 Beta, but the texture still does not appear in-game because the file is not inside the "items" folder: MCPE-152262.
When downloading the beta texture pack, both the old and new dark oak boat textures are present. Swapping the names of the old and new dark oak boat textures allows the new texture to display. I was able to create a resource pack with just the new texture under the correct name (and I verified that it works). I will provide the resource pack here if asked.