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Found in DWachs GUI-Patch, but surely has nothing to do with it.
You shouldn't be able to create what I attached. Just use the tools as numbered in the picture: First you build the tunnel, then you lower the full tile. This allows the low-slope-tool to be used on the tile, which flips the slope direction - already breaking the connection. I lowered the tile again so it's flat. This is repeatable, moving the tunnel down a layer each iteration.
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The same bug, or a similar one, is above ground as well. Strangely, the direction can not be flipped back.
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Maybe one should also hide the directional tools for underground to stop giving player these ideas ;)
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Honestly, I think it would be best if the landscape tools would not work for ways at all, and instead there were dedicated "way up" and "way down" tools. I suppose it works the way it does for historical reasons, but it's not intuitive at all.
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The problem with dedicated tools is, that these need new pakset versions. This is the limiting factor.