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A few examples of them being invasive. Some mushrooms discosoma for sure can easily release from the rock float elsewhere and rapidly spread. Like Kenya trees or plusing xenia can.
Rhodactis, yuma, and alot of the bonuce mushrooms can also release but rarely do. They split or tear of portions of their feet which grows into another mushroom. They very rarely ever appear in other areas of the tank where they weren't originally placed. So putting them on a island is effective in most cases.
The more invasive mushrooms just appear everywhere split more often and leave behind portions of themselves forming more mushrooms. With potential to become a true plague if un managed.