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ad the title says, there is no icons that I have used in previous times. They have disapeared,
Not sure what you are asking
I am unable to move the plant into harvest since the icons are not available, they have disappeared
If you click on a single plant then go into the details tab does it already have a harvest date? If for some reason a harvest date was set the icon will disappear.
You can also use the "edit all plants" feature and enter the harvest date manually if you need to.