This add-on makes villagers remember Farmland blocks around and, when any of these Farmland blocks disappear, they will try to convert it back.

The radius is 2.5, roughly.

Dirt blocks, Grass blocks and Grass Path blocks will be converted into Farmland blocks.

If the block going to be converted can not be converted into a Farmland block, it will be converted into a Grass Path block instead.

If the type of block is not even dirt, the villager will give up and forget the block.

• This is a behavior pack. Currently, there is only JavaScript edition. It is not impossible to make this add-on unversal but I just wouldn't.
• Works on all kinds of villagers, because it detects only the type of entity. I can add more filter, but I don't want to pay too much attention to this simple add-on looks not going to be popular.
• Doesn't modify anything. This add-on attaches to existing villager entities directly. Should not conflict with any other add-ons.
• The memory will exist only during gaming. Also, when the villager is re-loaded, the memory will be wiped.
• When the villager is moving, the coordinates stored could be shifted, which is a bug but I think it can also be considered as a feature that villager can expand the field randomly. Don't worry about safety, because mis-remembered will still be checked before converting. Anyway, I'm not going to fix it.
• Windows 10 PC only. This is a restriction from Minecraft. The reason why I don't use GameTest API is that GameTest scripts have to be launched using command.