If two or more mushrooms are placed side by side with the command, an error occurs in which the mushrooms disappear.
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Here is what is happening:
Mushrooms require a supporting block underneath, but they do not check for a supporting block when placed by commands.
When you place the second mushroom, it triggers a block update on the first mushroom.
That block update causes the first mushroom to break because it does not find a supporting block.
When the first mushroom breaks, it triggers a block update on the second mushroom, and then the second mushroom breaks for the same reason as the first.
The only bug here might be that you can place floating mushrooms with commands.