"Incompatible" as in the camera won't save the image as a 3D image, and you won't be able to use some kind of native system to export it.
A number of Panasonic telephoto lenses, for example, are "incompatible" with most of Olympus's Pen E cameras, but that's not because it won't work, the camera bodies won't use things like OIS and some other features won't function right.
The problem here is more to do with the fact that Panasonic's 3D lens isn't exactly... normal for the Micro Four Thirds standard. And this is kind of symptomatic of the earlier years of MFT, as Panasonic started doing stuff that wasn't specified in the standard. Olympus did the same thing, with a programmable function button on some lenses, that would be unconfigurable on Panasonic cameras...https://www.four-thirds.org/en/microft/other.html#i_125mm_f012_panasonic
As far as I understand, if you put this on an "incompatible" body and pressed the shutter, you'd probably get a pretty badly visually distorted image. I mean, have you ever taken a picture without a lens on the camera? You just get a colour blur.