@wyatttt : There are lots of these warnings in the console with Unity 2019.3.0f6 and Terrain Tools 3.0.0:
A meta data file (.meta) exists but its asset 'Packages/com.unity.terrain-tools/TestRunnerOptions.json' can't be found. When moving or deleting files outside of Unity, please ensure that the corresponding .meta file is moved or deleted along with it.
and
Couldn't delete Packages/com.unity.terrain-tools/TestRunnerOptions.json.meta because it's in an immutable folder.
Just warnings, but no idea if that has side-effects. So I thought I’d let you guys now.
ps: version 3 looks exciting.