If the FRITZ!Repeater is used in the Mesh operating mode Mesh Master, it only displays wireless devices in the list 'Known Wireless Devices in the Wi-Fi Network' under 'Wi-Fi > Wi-Fi Network' as connected to it if they are directly connected. Wireless devices that are connected to a Mesh Repeater (for example additional FRITZ!Repeaters) are not displayed in the list of the Mesh Master or are displayed as not connected.

You can find an overview of all of the devices that are connected to the Mesh Master or a Mesh Repeater under 'Home Network > Mesh' in the Mesh Overview of the FRITZ!Repeater (Mesh Master).