@Elana We are experiencing a similar issue.
After the customer selects a product and clicks the confirm button, a loading modal appears as shown in the screenshot, followed by the error message: “Server error.”
After reviewing our code logic, we confirmed that this “Server error” message is not returned by our app. Our app calls await shopify.resourcePicker to retrieve the product information, so it seems the error may be occurring within the Shopify resource picker component.
According to the customer, this issue only happens with one specific product. Other products can be selected normally.
The customer is not willing to grant us access to their store, so we would appreciate it if you could help investigate this issue.
The product that cannot be selected is: