Hey @DavidM, thanks for posting about this! Definitely a confusing experience. I believe the item linting error in the background field was a bug that was fixed in Cloud earlier this month, and in self-hosted version 3.8.1 (changelog note "Fixed an issue with code editor validation for color inputs in the Table component.") Some other threads related to that behavior:
Let me check into the event handler piece. Glad that as you mentioned, despite the error/red highlight in both cases, things functionally work 