Initially Nextcloud 12.0.3 updated to Nextcloud 13.0.1 on CentOS 7.x & Apache 2.4.6-67 & PHP 7.1.14
iPad & iPhone now Client Version 2.20.7
Apple iWork documents (Pages, Numbers, …) stored in NextCloud showing as folders in iOS app on all devices, previously appeared correctly and could be managed.
I have launched occ maintenance:mimetype:update-db & occ maintenance:mimetype:update-js and it remains the same.
Very similar to entry Apple Documents (Pages, Numbers) showing as folders
Sorry for my English