I’ve seen this popup 3-4 times now in the forum, it needs a good bugreport.
Low level, tooling for the /e/-recovery should be improved - offering a cli tool for adb to not work in the dark on encrypted files, (see this), but far better yet a real UI option to mount userdata and delete from a filebrowser as twrp can do.
The real solution is Android reserving space aggressively to not be sad when dalvik requests space for its cache. That is what the bugreport should be about, why Android fails the user.