An unexpected value could not be normalized

Never experienced this... Did you double check your custom code? Can you reproduce this on a clean install?

Hi, I am seeing also this error when I upgraded commerce to 2.36 from 2.33. As I checked I think this causing the issue, the addition of https://git.drupalcode.org/project/commerce/-/blob/8.x-2.36/modules/log/...

I am also seeing this error with REST export views for Commerce Log entities, if the view results contain any Log entity which has a template that expects Price parameters. Since a typical checkout flow implies an automatically-created payment after completion, the order's activity log will have an entry for the payment with its amount, and so you can't expose the activity log of non-draft orders.

I had the same thing happen to me recently. Thanks to the comment by @ts.ag, I remembered seeing something about logging on the Order settings page. When I changed the setting to "Prevent the save and throw an exception that may cause a fatal error," the problem disappeared.

I still cannot resolve this issue after attempting multiple configuration changes.

I am using the following Commerce modules alongside Drupal 10.4.0:

• Commerce Core 8.x-2.40 (I do not have Commerce Payment Example module installed)
• Commerce File 8.x-2.2
• Commerce License 3.0.1
• Commerce PayPal 8.x-1.8
• Commerce Shipping 8.x-2.11
• Commerce Stock 8.x-1.3

I have enabled PayPal Checkout (Preferred) as the only payment gateway with the correct Client ID, Secret, and Webhook ID, and I have selected Capture as the Transaction type.

I am using the Default order type with the Default checkout flow:
Log in
Log in or continue as guest (Guest checkout: Allowed; Registration: Not allowed)
Order information
Contact information (Require double entry of email: Yes)
Payment information
Review
Review
Payment
Payment process (Transaction mode: Authorize and capture)
PayPal Checkout payment process (Transaction mode: Authorize and capture)
Complete
Completion message (Default)
Files download
Sidebar
Order summary (View: Checkout order summary)
Coupon redemption (Allows multiple coupons: No)

Any help would be appreciated.