Can BACnet be daisy-chained (looped) on the Sensedge Mini?

No.

While BACnet MS/TP is wired in a daisy chain configuration, we support BACnet/IP and, for that, daisy-chaining does not apply: it would mean daisy-chaining Ethernet, which we do not support as it would require two Ethernet ports and some Ethernet-switching hardware, which our devices do not have.