Received multiple MediaStream object for single mid

@lorenzo ,
I have created the “multistream” mountpoint in “janus.plugin.streaming.jcfg”.
Below are the image of created mountpoint for your reference:

I iransmit the RTP packet from RTSP stream to Janus using FFMPEG.
Below is the example of ffmpeg command:

ffmpeg -rtsp_transport tcp -i rtsp://rtsp:rtsp@192.246.23.50:5540/b8c37f136 -c:v copy -an -f rtp rtp://10.12.55.149:5001

I have initially received MediaStream for mid=1, but after some second i have received different MediaSTream for same mid=1.

So, my question is why i received multiple MediaStream for single mid ?

Because before the new MediaStream received, i observed the stream goes to loading and after connect again.

Below are the onremotetrack event, where i received track and i fetch the MediaStream from track and attached it to the video element: