Tor should tell its pluggable transports when DisableNetwork gets set/unset
Orbot uses Tor's DisableNetwork feature to turn off use of the network when it wants to save battery. In fact, some people might even use it as a security feature to avoid touching the network at certain times.
But Yawning tells me that when Tor sets DisableNetwork to 1, nobody tells the pluggable transports to go quiet. Or turn things back on when DisableNetwork goes back to 0.