On ice worlds, there's bright red ground tiles all over the place that can't be walked on and contain fish. If I remove the lava planet mod, textures come back and the surfaces can be walked on.

Edit: I'm currently on a "Cold Biomes Planet", specifically.

Screenshots

Edit: I arrived at this planet with Lava Planet disabled, then re-enabled it so I could post a screenshot (assuming the error would be present again). Unfortunately I saved after I re-enabled the mod, so I can't tell what the original tiles were (sorry, I can find another planet).

With lava planet enabled:

https://drive.google.com/open?id=1NO7zeNsznKPd05xfIHXVl_DDuivP7ltg

Lava planet disabled:

https://drive.google.com/open?id=1e25c1D7tvWKrLoECllH5qgjZZZefLe7O

Er, this time it didn't happen when I enabled lava planets on an ice planet, but after leaving it on and hoping it was something random, I got the issue on an Uncharted Planet.

https://steamcommunity.com/id/ping-pong2012/screenshot/777359668601494065

yes this is an issue with the lava planets autoplacing the lava stuff.
That planet needs a fair bit of work, including new prototypes to craft regular resources from lava. for the time being the base mod gets the priority.