About HMD UI alpha when using Spectator Screen Texture in UE5.3

When exporting a UI like the attached image in png format and using it in Spectator Screen Texture, the display on the HMD will be unintended.

This problem did not occur in UE5.1, and it newly occurred in UE5.3.

If you have a solution, I would appreciate it if you could let me know.

There is additional information.

I created two images in Photoshop as images for the UI. (test_00, test_01)

In the case of test_00, the display is strange.

In the case of test_01, the display is correct.

It seems that if you add even a small amount of semi-transparent black fill in Photoshop,
the display will be correct.

I’ll also attach a project file where you can check this. *You can replace the UI image with Blueprint.
DebugUE53_HMD.zip (320.0 KB)

The current method of test_01 can solve the problem, but it will become darker as a little black is mixed in.
If you have any fundamental workarounds, it would be helpful if you could teach me.