Reproduction steps:
1. Open the attached project “ReproProject”
2. Build the project
3. Observe the Console Window

Expected result: The build is completed successfully
Actual result: Build failed with the error CS0019: Operator '!=' cannot be applied to operands of type 'JobHandle' and 'default'

Reproducible with: 2021.3.37f1, 2022.3.26f1, 2023.2.19f1, 6000.0.0b16

Reproduced on: Windows 11 23H2 (22631.3007), Windows 11 (10.0.22631) 64bit (user’s)
Not reproduced on: No other environment tested

Workarounds:

• Use the Equals() instead
• define the function inside {{#if ENABLE_UNITY_COLLECTIONS_CHECKS}} <function> {{#endif}}