Subscenes on 2021.3 Crashing Build

I am trying out Entities for my first time and used Codemonkey’s Subscene tutorial to learn. Everything works fine in the editor. But when I make a build and load a subscene the game crashes.

I have tried making a build with the subscene loaded and not loaded, autoload on and autoload off. I have added the subscenes to the scenes for the build and tried without them added. The package com.unity.platforms.windows gives errors so I have not built with that installed.

Any suggestions would be great.

If you’re using entities for the first time, why are you using 2021.3? It means you must be using an old version of Entities.

I suggest starting on 2022.3 and latest 1.1 entities (or 1.0 if you don’t like the idea of a .exp tag)

It is on a project I was already working on. I was trying to use less ram by not having all parts of the level active. Additive scenes were loading too slow. I did try upgrading the project to 2022.3 but it kept crashing when editing the scene. And yes I was an old version 0.51 with the 2021.3 version. Maybe this is too much to add to this project but was seeing if I was just making some simple mistake while trying to build. As it works great in the editor.