LB and U2019.3.b1
We’ve been working hard to get LB ready for the release of Unity 2019.3. Unity have made a number of changes to the Unity Editor behaviour. Many of these issues have been resolved and are already part of the latest LB 2.2.0 Beta (see [here]( [BETA PROGRAM] Landscape Builder - realworld, GPU acceleration, prefab placement page-9#post-4980017)).
However, there is a bug with U2019.3 beta that we’re still working on and it affects the Group Designer. When zooming and moving around the Group Designer prefabs will disappear from view. If you refresh the Group Designer they re-appear but it is annoying. We are currently working on a fix and will post an update in the LB Beta Program Forum when it is fixed. In the meantime, for active games you are working on, we suggest keeping on one of the supported and released versions of Unity. LB currently supports U2017.2 to U2019.2.x.
EDIT: This should be resolved in LB 2.2.0 Beta 7+.