Not sure about preconditions (maybe it is the problem with data that we have in project) but currently we encounter Internal error on "Saved Queries" and while trying to create QQL widgets. It is reproduced under different accounts with different roles (i asked at least 4 colleagues to double check).
Steps for reproduction
  1. Open "Saved Queries" tab
Actual result:
List of queries is empty. Internal error message in logs.
payload is '{"filter":{},"limit":10,"offset":0,"page":1}'