After you update your Property URLs in Hospitable, an orange warning triangle can still appear next to them. The URLs did save correctly. The triangle is not about the URL format or whether it saved.
Why this happens. Hovering over the triangle shows Hospitable’s actual message: "Your custom site is not using the Hospitable booking widget. Please add the widget to your site." Hospitable checks the page at each Property URL for its booking widget script. If your site books through a different widget and completes checkout on Hospitable’s hosted booking page, this warning appears even though the URL is correct and bookings work normally. Re-saving or reformatting the URL does not clear it.
What you can do. If you need the warning removed, you would need to add Hospitable’s widget loader script to each property page. Adding the script does not change how the page looks to visitors. If you are concerned about whether this warning affects Google Vacation Rentals eligibility, contact Hospitable support directly for confirmation.