ECS System OnUpdate not being called on Unity 2020.1b7 + UniRx

Questions & Answers
1

I am not able to get DOTS working on Unity 2020.1.b7 after I’ve updated my project. But another test projects are working. What can be wrong? I tried to reimport it a couple of times. Tried to use the same packages manifest files from projects that work this doesn’t help.
OnUpdate() just not called for all systems. Also for ConvertToEntity component too so conversions not working. Both for sub-scenes and for single components.

Also, there are no compile errors or runtime errors.

Does anyone has this problems?

2

So I was able to fix this issue. It was related to UniRx plugin v.5.5.0. Deleting this plugin makes ECS system working. Updating to the latest UniRx 7.1.0 also fixes this issue.
But this anyway looks like a bug because plugins should not affect Unity. And this may happen with any code. Could be some bug in legacy code upgrading logic that was not able to upgrade some code from UniRx plugin.
I will submit a bug report.