Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/Issue2.unity” Scene
3. Enter the Play Mode
4. Observe the Console

Expected result: No Errors exists
Actual result: Error “Input in inputBuffer was synchronized 1337“ is present

Reproducible with: 1.9.2 (6000.0.63f1), 1.10.0 (6000.3.0f1)

Reproducible on:
Play Mode

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:
- Forum thread: https://discussions.unity.com/t/netcode-for-entities-feedback/1694556/2
- You can also look into the Entities Hierarchy by opening from Window > Entities > Hierarchy, select ClientWorld, check the two ghost entities. Notice that both of them have values in the DynamicBuffer of InputBufferData<TestInput>, which means it has been synchronized from the server.
- Reproducible when using 1 thin client