ConvertToEntity and SubScenes both not producing entity's in Unity 2021 LTS (Entity .51)

Entity Component System (ECS)
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1

The game I’m working on is a few years old now so we are stuck on unity 2021 LTS with:
Entities Version: 0.51.1-preview.21 - August 02, 2022
Hybrid Renderer: 0.51.1-preview.21 - August 02, 2022

I added a ConvertToEntity script on a simple cube. But when I press play nothing happens, the entity is not created and the old gameobject isn’t destroyed or anything, picture is attached. When I press play the gameobject is exactly the same afterwards.
Additionally I have a subscene with cubes and spheres. I “Close” it for editing and press play and nothing is created. Before I press play it looks like there are entities but they disappear after I press play. Pictures attached. What am I missing here? Why isn’t it working? Thank you for your time and help.

9406124--1316897--afterPlayhierachy.png

9406124--1316900--afterPressPlayEntityDebugger.png
9406124--1316900--afterPressPlayEntityDebugger.png2129×1070 146 KB

9406124--1316903--cubeSubSceneTHing.png
9406124--1316903--cubeSubSceneTHing.png570×629 40 KB

9406124--1316906--cubeSubScene.png
9406124--1316909--entityDebuggerBeforePlay.png
9406124--1316909--entityDebuggerBeforePlay.png1545×1055 211 KB

2

Here is a picture of the cube that I just added the ConvertToEntity script to. Not sure why it doesn’t do anything.

9406127--1316915--cubeSetup.png
9406127--1316915--cubeSetup.png756×771 55.3 KB

3

I figured it out!
There was a random part of the codebase that injected things into the player loop, the issue was instead of using PlayLoop.GetCurrentPlayerLoop()
It used: PlayerLoop.GetDefaultPlayerLoop()
Which overwrote the play loop and made it I guess not include DOTS related things.
Switching to GetCurrentPlayerLoop fixed the issue.