On top of that, smoothing doesn’t seem to be good at smoothing anymore?
I would post this in bug reports, but I’m not sure if this was by design or not. If there are any expert terrain users here, please let me know if you’ve gotten around this and how.
You should be able to fill in those gaps perfectly fine using the grow tool.
I could fill in the gaps if you would like to share the file.
The smoothing tool looks as if it is working as intended; you have air underneath the terrain, which is why the tool is cutting through the ground.
Try adding or growing terrain beneath, and then using a larger brush size + lower strength. I’ve found this works quite well.
Yeah, you have the old tools. I think I’m forced into the new terrain tools they’re testing. Which is incredibly aggravating. I thought this update was live and pushed to everyone. This makes my find for the solution ever more upsetting.
As for the smooth tool, I had the same problem and they were right: there is not enough terrain underneath and it is cutting through instead. Don’t know why but all it needs is just some terrain under and that will fix it I believe.