When using search builder to find contacts that are in multiple specific groups (AND, not OR), 0 results returned
There was a bug that got introduced in the 5.10 series which broke these types of searches, i believe there was a patch release maybe 5.10.4 that fixed it but this is the specific fix https://github.com/civicrm/civicrm-core/pull/13667/commits/8966cd19d7897bdadc0588cab2c81df140759efc