oracle column comments are missing

[SabineGl]

I'm using dbt osmosis v0.13.2 and wanted to use it for an oracle database. But table comments are missing.
The user has rights to read oracle metadata/column comments.

Then it cant read some tables even the table exists, has data and is available in metadata "all_col_columns".
Relation <database.tablename> does not exist in target database, cannot resolve columns

What can be the issue for this?
Other tables are found but no table comments are available.

THX