All shares lost after upgrade to 14.0.8

hi, when i try to update 13.0.8 to 14.0.8, after the successfull update all previously existing shares are gone!
we use external storage via smb, the external storages are available to admin(group) and shared to user groups, the users in this groups can reshare files or folders via public link or email. after the update, the external storges are not shared with the user groups and all previously existing public links are gone, using one returns only a “file not found”. but the shareing feature is still active, new shares with user groups or public links can be created and are useable. there are no errors in the log related to the update or any

where to look at to understand whats happening?

thnks, konrad

Nextcloud version: 13.0.8
Operating system and version: Ubuntu 16.4
Apache or nginx version: Apache 2.4.18
PHP version: 7.0.33