Lightroom Classic 15.6: Spacebar activates the Hand cursor, but dragging fails to pan images in Develop, including Masking.

I'm having an issue with panning images in the Develop module of Lightroom Classic 15.6 on Windows 11(Build No. 26200.9711).

When I hold down the Spacebar, the cursor changes to the Hand icon as expected, but clicking and dragging doesn't move the image. This happens not only in Masking but also when using other tools in Develop.

Steps to reproduce:

1. Open a photo in Develop and zoom in.

2. Select Masking > Brush.

3. Hold down the Spacebar until the Hand cursor appears.

4. Click and drag the image while holding the Spacebar.

Expected behavior:

The image should pan while I'm holding the Spacebar and dragging.

Actual behavior:

The cursor changes to the Hand icon, but the image doesn't move.

What I've checked so far:

• Dragging the image directly at 200% zoom works fine.

• Panning through Navigator in Develop works normally.

• Panning zoomed images in Library also works.

• I haven't tested disabling GPU acceleration yet.

Since panning works normally in these other cases, the issue seems to be related specifically to using the Spacebar in Develop.

Is this a known issue in version 15.6, or is there a workaround I could try?