Cultivated Towercap Mushrooms = Cave-In

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So, I planted 4 cultivated Towercap Mushrooms in L1 Mine and there has been no activity, no mining, nothing has changed in this area except for the Towercaps growing to completion.

Upon chopping down a Towercap Mushroom a cave-in occurs. This happened with all 4 of them. Each were planted next to an unmined cave wall. Each grew fully and spores were collected from each before they were chopped. I would like to reiterate that no tiles were mined inside their support area at all.

Is it normal for them to cause a cave-in?

I have chopped down naturally occurring Towercaps in lower levels and did not cause a cave-in. Is this an issue with planting them in an unnatural area being in a level 1 mine? Like... wtf... I was lucky to not get knocked out, but still... wtf is going on???