The display of inherited areas and components have changed due to various unrelated changes in the page-editor.
IIRC inherited areas and components were always shown in the page-structure but annotated with 'inherited' on edit-bars and their actions were disabled.
Looking at the code this changed in MAGNOLIA-5439: Now all of a sudden inherited areas are wiped from the structure, but leaving the components in, which causes several side-effects, e.g. components associated with the parent-page instead of an area and different display for inherited areas vs inherited components.
This ended up crashing when PAGES-62 was introduced and blindly casting the parent of all components to MgnlArea. This was patched in a QA commit, which now consistently removes all inherited elements, but breaking the initial idea of still displaying those.

Some more notes:

• the 'inherited' annotation was former criticized for not being i18nable.. so maybe rather have some sort of icon for display.
• Do we actually need to display the inherited ones? adding more noise to the page.