mika
if you can try this, it fixes the issue for me: https://github.com/unitycoder/UnityPointCloudViewer/issues/126 (if you have newer unity version, or urp, let me know which one, if that code doesn't work...
unity confirmed this as a bug also, https://issuetracker.unity3d.com/issues/graphics-dot-drawproceduralnow-from-onrenderobject-breaks-when-worldspace-canvas-is-in-cameras-view and gave one workaround: "I have noticed that creating a new Universal RP project and reimporting your Assets folder makes the drawing...
unity added more info, that its by design: > After a further resolution with developers, we have decided that this issue is By Design due to the following reasons: >...
ah ok, ill need to check on the tiles viewer. (le me know your unity/urp version also) that custompass feature, it uses data from my viewer, so its already loaded...
ok then that script above might not work, ill check with that version.
Now first message contains steps for V3 format also. @Rickmc3280
yeah had some issue with that fix, caused more flicker / disappearing tiles (but did improve the loading times), so still looking into better fix for that.
quite sure that was it, but cant remember right now if i pin pointed it last time somewhere there.
suggestion: (selectable fields) 
this is coming later on standalone converters https://github.com/unitycoder/UnityPointCloudViewer/wiki/Commandline-Tools