Why do I get "Camera2D overridden to physics process mode..." warning when my process_callback on Camera2D == Physics?

Godot Version

4.6.2.stable

Question

I am getting this error on start:

W 0:00:01:457   _update_process_callback: Camera2D overridden to physics process mode due to use of physics interpolation.
  <C++ Source>  scene/2d/camera_2d.cpp:85 @ _update_process_callback()

i changed Camera2D’s "process_callback” property to “Physics”, but the warning still pops up on every start. I have physics_interpolation enabled in Project Settings → Physics → Common.

Note that if I remove my Camera2D from the scene, the error is still appearing. Is there some sort of “default camera” that is loaded, which might be causing the error? If so, how can I set the “default camera” to be process_callback = Physics so that this warning won’t appear in the debugger?