I bonded 2 SFP+ port with 802.11ad mode (layer 2 hash). There are other MikroTik devices running RSTP in the same layer 2. When enabled RSTP, the 2 SFP+ ports are immediately entering blocked mode. This is the case on RouterOS 6.42.1.

Tried SwOS also, when all ports are set to passive and 2 SFP+ physically connected to an uplink 802.3ad bonding port (all other settings are default), they switch between forwarding and blocking state every few seconds.

On RouterOS 6.43rc12 one SFP+ port is not working so I cannot test... even LED not lighting up.