Dataset refresh causes "ODBC error - File Database is not found" but loading to Power Query works

Hello everyone,

like the title says, i can load the data from my ODBC datasource into Power Query, but after "close & apply", the following issue occurs: "ODBC: ERROR [08004] [ODBC Firebird Driver]File Database is not found" at the refreshing window

Therefore i cant schedule updates or refreshes to the Dataset in Power BI - Service either, huge problem.

Here are some important sidenotes:
1. My Database administrator recently updated the Firebird Database from 2.5 to 3.0

2. The ODBC-Source worked just fine with 2.5

3. The ODBC-Source Path is just the raw Firebird Data (main.FDP) the first error occured here, usually you can directly connect to main.FDP, after the Update to 3.0, its not possible. Therefore i copied the main.FDP and pasted it into an empty Folder.
4. The ODBC Setup now works just fine with that copied main.FDP
5. But as the title says, "ODBC: ERROR [08004] [ODBC Firebird Driver]File Database is not found"

Bizarrely, i can create a DATAFLOW Connection to the same datasource / same Gateway