[role]s are not contained by their required parent element
Webflow uses ARIA in some elements, such as TABS and the Hamburger menu. You don't need to do anything, it works fine.
If you get this error, check Custom Code or Element Settings > Attributes
Google Lighthouse says
Users of screen readers and other assistive technologies need information about the behavior and purpose of controls on your web page. Native HTML controls like buttons and radio groups come with that information built in. For custom controls you create, however, you must provide the information with ARIA roles and attributes. (Learn more in the Introduction to ARIA.)Some ARIA roles must be owned by specific parent roles. For example, the tab role must have an element with the tablist role as a parent. If the required parent role isn't present, assistive technologies may announce the child roles as plain text content rather than the intended control.