Bug Systems inside a namespace have no effect on physics when their name is... somehow wrong?

Steps to reproduce:
- Install Unity 2020.2.0a21
- Create a new Unity DOTS project named "PlanetaryPhysics" with the following versions:
- "com.unity.entities": "0.14.0-preview.18"
- "com.unity.physics": "0.4.1-preview"
- Create a physics object (remove default collider, convert to entity, add physics shape, add physics body)
- Create a directory named "Aaaaaa"
- Create a system inside the new directory named "PlanetaryGravitationalForceSystem"
- Add the following code to the System:

Code (CSharp):

1. using Unity.Entities;
2. using Unity.Transforms;
3.  
4. namespace Aaaaaa
5. {
6.     public class PlanetaryGravitationalForceSystem: SystemBase
7.     {
8.         protected override void OnUpdate()
9.         {
10.             Entities
11.                 .ForEach((ref Translation translation) =>
12.                 {
13.                     translation.Value += 100;
14.                 })
15.                 .ScheduleParallel();
16.         }
17.     }
18. }

Expected behavior: The physics objects should fly across the screen
Actual behavior: Nothing
Steps to fix: Rename the System to anything else or move it out of the namespace

The error seems to not stem from the length of the system name, since the code works fine when naming the system "Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa". I don't know if there are some weird keywords I've hit or if the fact that my system starts with the same word as my project is relevant.

 

Sounds like you might be hitting an issue with ordering, where changing the namespace/class name would implicitly change the order since none is specified. If you want to change physics you either want to order your system to be
- before BuildPhysicsWorld (before physics step)
or
- after ExportPhysicsWorld (after physics step)

If it happens in between these, physics would be running on an outdated version of the Translation and overwriting it.