When this mod is present, uneaten cakes will be harvestable, dropping as an item when broken, and will also be moveable by pistons.
Mod support is handled on a per-request basis. Currently, Harvestcraft is supported in 1.12.
As of 1.14, this mod can be replaced with a data pack if you do not care for the piston functionality.
The data-pack-only version of this mod can be downloaded from projects/persistent-cake-data-pack.
Bugs, suggestions, and crashes should be reported to the GitHub issue tracker.