Datagrip throws error about MaterializedView which is a Table

Datagrip 2026.1. (and many former versions) with OracleDB using 23.5.0.24.07 JDBC4.3

We have two nearly identical users WWWADM and WWWTEST. 

With WWWADM all looks fine and works. Ok, performance sometimes is worst, but…

With WWWTEST Datagrip throws this error:

Unexpected error (ResultIsNull) encountered when performing Retrieve materialized view sources via XML for 1 views (KVTOP3_MENU): Result is null when retrieving materialized view sources pack 0 of 1, the pack size is 1.
Result is null when retrieving materialized view sources pack 0 of 1, the pack size is 1

But KVTOP3_MENU is a table and not a MaterializedView!

If I look into the tree “tables” of this user, it's damaged, because tables, views, sequences and materialized views are displayed together, mixed together, while in “views” or “sequences” I see tables…