When fertilizing with either plant material or garden lime, plots that have been previously fertilized will randomly appear unfertilized.

There is also an issue possibly visually that plant material only needs 78 pieces to fertilize a section of a plot, but if you relog the section will appear unfertilized and allow the prompt to fertilize again, which allows the addition of 20 more pieces. Does this mean the minimum amount is actually 98 pieces?

This seems to possibly be incorrect also due to the visual bug as a full plant material forces the player to use 108 pieces, but even this sometimes seems to randomly fluctuate. Using a plant material with 109 pieces leaves 0.9 pieces behind. Other values sometimes gives different results.