TYPO3 Core

It's not obvious whether this is a bug or if it's by design, but TYPO3 will generate the processed folder for a file mount in the root of the website rather than when "Is writable" is false for the storage folder.

This poses a problem, for example, we have a project with a folder (legacy/) full of imported media from a previous site, which we don't want editors to be able to augment/modify. It means the web root needs to be writable by the web server/TYPO3. It would be nice to keep the processed ("processing folder") folder inside legacy/, despite the "is writable" setting, rather than having it get plopped into the web root.