While cubicchunks compatibility mostly works, there seem to be a few remaining problems. Take this, for example:

https://pastebin.com/W0EEMpSE

Not entirely sure what caused it, it kinda just happened.

Could you please send us a screenshot of the place where this happened? Like, at the coordinates that the log references?
And could you use spectator mode to fly underground and see if you can find anything interesting?

@Robijnvogel The coordinates are x=512, y=72, z=180. I actually haven't checked that gateways generate correctly at all using CubicChunks,

Could you check if this build fixes it? https://github.com/DimensionalDevelopment/DimDoors/releases/download/untagged-0c50e29916cc1be445ad/DimensionalDoors-3.0.8-273.jar

Sure, I'll pay more attention to whats happening.

Seems to work so far, flew til I found a gateway in fresh chunks. No idea if it works outside of normal minecraft height (0-255), but I assume that gateways wouldnt generate outside that anyways. I will update this If the problem occurs again.