Camera RAW showing a different white balance even no adjustments made

Hang on... c.p.'s post made me look again.

This isn't a raw file! There are no workflow options at the bottom of the ACR window.

This is the ACR filter used on a layer in the RGB file from Photoshop. That's something completely different.

Please repeat with a raw file in ACR, and then the same file as opened from ACR into Photoshop.

Please post about Beta problems on the correct Forum. 

https://community.adobe.com/t5/photoshop-beta/ct-p/ct-photoshop-beta?page=1&sort=latest_replies&filter=all&lang=en&tabid=discussions

What are the Edit > Color Settings? 

What is the actual Color Space of the opened image and what is the Color Space chosen in Camera Raw? 

To be clear - #2 opens into Photoshop as #1? This is a direct ACR > Photoshop?

This is the monitor profile. The profile itself can be defective (which can affect applications differently), or one application isn't using the correct monitor profile.

It can also be a GPU bug, which is the flip side to the same coin. The conversion into the monitor profile is executed in the GPU, and a marginal profile can cause a marginal GPU driver to fail. The thing is, they both need to work correctly.

Are you using a calibrator to make your monitor profiles? Which one?

Is this a dual display setup, like a laptop + external monitor?

BTW - I see you're running the beta. A beta is basically for exposing bugs, so it's more or less what you can expect. If you need a stable system, don't use the beta.