Since the Height of the Adult Villagers is 1.95 Blocks they can't walk through a space of 2 Block High when there's a Carpet, in some Buildings the Villagers can't access their respective Work Station because there's one or more Carpets that blocks it's pathfiding.

Besides highlight the issues I will also provide solutions to these problems.

Savannah Village

- Library

savanna_library_1.nbt

Solution: Replace the Carpet and the Acacia Planks underneath with Wool Blocks.

Snowy Village

- Mason's House #1

snowy_masons_house_1.nbt

Solution: Replace the Carpet and the Spruce Planks underneath with Wool Blocks.

Taiga Village

- Library

taiga_library_1.nbt

Solution: Remove the Carpet.