public int renderQueue { get; }

Since different Render Pipelines require different render passes a shader's render queue depends on the active Render Pipeline.

Note: When Unity runs in batch mode, Scriptable Render Pipelines (SRPs) are only loaded the first time something renders. Loading an SRP modifies the subshader selected for a given material, which can change the value of this property.

Additional Resources: RenderQueue, Render queues and sorting behaviours in the Built-in Render Pipeline.