I added the file :- app/design/frontend/VENDOR/THEME/Magento_Catalog/layout/catalog_category_view_selectable_[ID]_name.xml
Edited the category in the backend to use the Specific Layout (Catalog->Categories->Design->Custom Layout Update->Select "name"
)
Saved. I get the message "You saved the category."
Clear cache.
Refresh category frontend and category backend, but changes have no effect.
Besides, in the category backend, "Custom Layout Update" appears as "No update". So the change is not saved without any error.
Best Answer
Probably is a known bug, see this: https://github.com/magento/magento2/issues/27942