MRTK and Unity 6000.3

[pilat-bartosz]

I'm using MRTK with the newest Unity LTS, and it mostly works fine. The problem I have is that the mouse cursor interactions don't work in the "flat mode".
I recreated a simple canvas with an action button and a sphere.
I can confirm that it works with simulated hands (LShift/Space + LMB).
I compared my setup with an older version from the samples, and it looks the same.
Is it a bug with the newest version of MRTK (or Unity), or is it something wrong in my setup?

Unity Version: 6000.3.2f1
MRTK:
org.mixedrealitytoolkit.core: 4.0.0-pre.2
org.mixedrealitytoolkit.input: 4.0.0-pre.2
org.mixedrealitytoolkit.uxcore: 4.0.0-pre.2
org.mixedrealitytoolkit.spatialmanipulation: 4.0.0-pre.2
org.mixedrealitytoolkit.standardassets: 3.2.0
org.mixedrealitytoolkit.uxcomponents: 4.0.0-pre.2
org.mixedrealitytoolkit.uxcomponents.noncanvas: 4.0.0-pre.2