GROUP BY on duplicate expressions using functions throws error "IDB-2001: ... is not in GROUP BY clause." on Columnstore

The attached query throws the mentioned error when using Columnstore, but not when using InnoDB.
Furthermore, using Columnstore, omitting the function calls also works.

While this is for sure an unconventional query, this is generated by a third-party BI software, where we cannot influence how generation of the SQL statements is done.