Aquifers incorrectly being removed

[eTzmNcbkrng]

I'm using a combination of the following commands with the expectation that all aquifers in the world would be converted to light aquifers, no more than 2 levels deep.

		"aquifer drain --all --skip-top 2": {
			"autostart": true
		},
		"light-aquifers-only": {
			"autostart": true
		},

So far I have not come across a single aquifer, it seems as if all aquifers are being completely removed.
When choosing an embark location, the window shows there should be aquifers present, however using gui/reveal after embark shows no aquifers present.

My assumption is that there is a problem with the --skip-top 2 flag, it's described as not applying to the top x levels of aquifer, however, when used in a different context, it starts applying that command x levels below the surface, perhaps the conditional nature of this flag has gone awry at some point?

Edit: version 43.10

[eTzmNcbkrng]

Did some testing on a 4x4 embark with both heavy and light aquifers.

aquifer drain --all --skip-top 2 & light-aquifers-only: No aquifers
No aquifer modifications: heavy and light aquifers
aquifer drain --all --skip-top 2: No aquifers
light-aquifers-only: Aquifers in same location as no modifications, but all converted to light.