I have created am OAuth 2.0 (3LO) integration project in the developer console to consume Jira Cloud APIs. Initially I was able to set the callback URL and build my client project based on that, and it's working great. Now I need to deploy my client project for which I need to update the callback URL but it's not working for some reason. See the following screenshot.

The 'Save changes' button is disabled even though I have made changes and that's why Discard changes button appeared.
Any idea how to fix this?