HLS Stream stops abruptly when RTMP streaming stops

I am using ffmpeg to livestream my screen with nimble RTMP for public HLS players.
Tere is a delay between 10 & 15 seconds, that's fine.

The problem is : When i stop ffmpeg, it stops feeding the rtmp protocol, the nimble HLS play stops after few seconds and doesn't stream all the received packets.

I don't think that's a normal behaviour, am i missing some configuration ?

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I have tried with nginx-rtmp and it works fine. I looking for a solution with nimble.

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Streaming command :

ffmpeg -y -v info -f x11grab -draw_mouse 0 -r 30 -s 1280x720 -thread_queue_size 4096 -i :0.0+0,0 -f pulse -thread_queue_size 4096 -i default -acodec aac -strict -2 -ar 44100 -c:v libx264 -preset veryfast -maxrate 2976k -bufsize 5952k -pix_fmt yuv420p -r 30 -crf 17 -g 60 -tune zerolatency -f tee -flags +global_header -map 0:v -map 1:a [f=flv]rtmp://nimble.my.domain:1935/live/test

Probably you can setup DVR for your stream with minimal loop duration (1-2 minutes) and use playlist_dvr.m3u8 URL for playback - in this case last minutes will be available for playback after end of streaming. Please read more about DVR features here: https://wmspanel.com/nimble/dvr