New test composition with another box drawn with layer.make.color as a comparison. Both boxes are drawn now at same position with same anchor position, but rounded rectacle jumps to different positions and layer.make.color -box works as it should.
Just tested the Get Mesh Values node and I still get the "There was a problem running this composition" error even with a blank new composition with only that node.
But from the history of the updates on Github it seems several nodes have been updated 2 days ago but not this one (latest update 2 months ago).
I hope the update will also fix the bug when the node is used to retrieve the vertices from Meshes that are being deformed by Add Noise to 3D Object which bugs since 1.2.4 (ran fine in 1.2.3, since the update of the Add Noise To 3D Objects in 1.2.4 to support noise deformation for points perhaps).