Bug report: Resolve viewer caches old version of image

Resolve 17b8 running on Windows 10.

Here's a video showing the problem:

Steps to reproduce:

1. Open Resolve and import a PNG or other image.
2. Drop image into timeline.
3. Edit image externally in Photoshop or similar, save, overwriting the previous file.
4. The still frame in Resolve's viewer still shows the old version of the image.
5. Click play and it's still on the old version.
6. Relink the clip and click play. Now the updated image displays.
7. Click stop. The old version now comes back for the still frame.

Preferred behavior: Resolve picks up any image changes without relinking. Resolve shows the correct still frame in the viewer.

I'm seeing this as well in Studio 17b8 for Windows.

Previous versions would always show the updated image for me.

This bug is still present in 17b9. 17b7 doesn't have the problem.

I am seeing some improvement in Beta 9, where the image will update under certain conditions.

But it's still not working properly, as it should always automatically update, without conditions.