The NamespacesControl field type in CommunityConfiguration logs this warning to the console when selecting namespaces from the menu:

[Vue warn]: Attempting to mutate prop "inputValue". Props are readonly.

This is caused by an explicit assignment:

// HACK, better way to remove the user typed text in ChipInput?
input.value.inputValue = '';

In practice, I didn't check whether the assignment is treated as a no-op. Also worth noting that the warning isn't logged in production, presumably because warnings are only logged when using a dev build of Vue?