RDS Performance Insights 'Slice By Waits' shows maximum waits for "Unknown" host

We are using AWS RDS Performance Insights and trying to understand which host was responsible for DB load, when viewing dashboard 'Slice By Waits', tried to check "Top hosts" under Dimensions tab, however it shows maximum "waits (AAS)" were for the 'Unknown' host.

We are using PostgreSQL DB engine(version 12.11). Is there a way to get the actual host IP address for the hosts that are marked as Unknown?