Upscaling ControlNet's output to match target when InPainting -- not supported?

[Alchete]

Here's a workflow that illustrates the issue. I'm wondering if this is a bug, a missing feature, or just something that can't be supported.

1. Put 500x500px image in ControlNet as a base. Select any processor.
2. Set A1111 image size to 1000x1000
3. Generate -- this works fine
4. Send the result to inpainting
5. Use ControlNet with the same 500px image to guide inpainting
6. Generate -- the resulting ControlNet image is squashed, off to one corner, etc. And doesn't apply at all to the inpainted area

When inpainting, I imagined that the lower-res Control net image would be rendered in its entirety, upscaled to match the target, and then only the inpainted portion would apply. However, this isn't what happens.

Is this something that can be supported, or am I thinking about this wrong? Thanks