I suspect the Aqara hub is acting as another coordinator (like the ZBT-1), so what you’ve got is two separate Zigbee networks. They will always be invisible to each other - you can only have one coordinator in a network.
You may be able to add the sensors and lights etc. from the Aqara network to the ZHA network instead, but probably not vice versa - most manufacturers hubs only work with their own devices. They can’t be on both.
Lots of good stuff on Zigbee here: