Mod name: Automatic Doors

Doors only function at y-levels between the bottom of the door and two blocks up (e.g. if a grass path or slab is next to the top block of a door and a player walks on it, the door opens). However, if there is a block that isn't a full block high (such as a grass path) in front of the door, it will not automatically open.

It's not technically a bug, so that's why I'm submitting this as a feature idea.

Left: door opens
Right: door does not open

Thanks for submitting the bug report and using the mod! This has been fixed in version 1.7 of the mod.

https://www.curseforge.com/minecraft/mc-mods/automatic-doors