Hi Florian,
That looks like it could be a new bug related to IMC's use of the MySQL JDBC connector:
failed to parse the connection string near ';useOldAliasMetadataBehavior=true'
The connector is using a newer version since the E0703 switch to OpenJDK and thatcould be the culprit if it's a parameter that's no longer supported by the new connector.
One more thing you can check is the deploy\log\dmalog.txt. Do you see any error like:
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'CEST' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
Just checking if you might be running into an issue matching what was mentioned in the other upgrade issue post here, also related to MySQL JDBC connector.
Otherwise I think you should open a support case to look into this further.