Edit: Welp, of course after posting this I realized that my scene view is in authoring mode and hence why it was not showing runtime data while opened.
So this started happening , I assume after updating to Entities 1.2.3 - will check tomorrow if downgrading fixes it.
But this is the scenario, I have a subscene where some systems are running that spawn entities from prefabs.
If my sub scene is closed, everything works flawlessly, things spawn I can see them.
As soon as I click to see the authoring view, all entities disappear both in game view and scene view.
Closing the sub scene makes them visible again. This only happens for Prefab entities, anything that is placed on a scene manually, shows up all the time without a issue.
There is also another really weird scenario, if I spawn a entity from a prefab (PrefabA) and use setName("Entity ABC") to change the hierarchy name, If my subscene is opened, it shows the name, but as soon as click on the entity, the name magically reverts back to the prefab name, this occurs on ANY entity instantiated from any prefab - if scene is close as expected there is no name on the hierarchy.
I am not exactly sure whats causing any of this, apart from I updated to 1.2.3 - any guesses of whats going on?