We are experiencing the same issue as reported here: https://community.powerbi.com/t5/Desktop/Users-with-multiple-security-roles-suddenly-can-t-see-data/...
The Power BI service is throwing an "SecurityFilteringBehavior=Both" error on all visuals for RLS users linked to multiple roles. There are no bidirectional security filters present, after checking in Tabular Editor and the relation editor in Powr BI. It happens on all datasets that have the same users in different roles in RLS. Those assigned a single roles experience no issues.
For us this behavior is new and has worked until a week or so ago. I have not been able to resolve it other than having non-overlapping roles as a workaround.
May I know whether the tables in your report coming from two or more separate data sources? If so, what kind of connect mode did you used to connect to these data source? Import or Direct Query? I found a similar issue reported internally but I need to confirm whether these two issues are completely same.
Community Support Team _ Caiyun