Restarting Janus gives SRTP auth_fail

General
1

I am playing around with the streaming plugin and it works great with RTP. However when using SRTP it works tell I stop and restart the Janus server.
After a new Janus start, I get srtp_err_status_auth_fail errors on multiple SRTP streams.

It is like a lotery which input SRTP stream will gives the error. Sometimes all of them keep working but most of the time all of them will gives the error and don’t work.

To fix the issue I have to restart ffmpeg. Afterwards it works great again.

I am sending video with ffmpeg with the following command:
ffmpeg -i INPUT -c:v copy -flags global_header -bsf dump_extra -f rtp -payload_type 96 -srtp_out_suite AES_CM_128_HMAC_SHA1_32 -srtp_out_params KEY srtp://SERVER:7001?pkt_size=100 -nostdin

After stopping and starting Janus, I get the following error:
Aug 02 09:49:19 ubuntu janus[3514132]: [ERR] [plugins/janus_streaming.c:janus_streaming_relay_thread:7989] [camera] Video SRTP unprotect error: srtp_err_status_auth_fail (len=90-->90, ts=2982702695, seq=8283)

Config:

opslag: {
        type = "rtp"
        id = 10
        description = "camera"
        audio = false
        video = true
        videoport = 7001
        collision = 1000
        videobufferkf = true
        videopt = 96
        videortpmap = "H264/90000"
        videofmtp = "fmtp:96 packetization-mode=1; sprop-parameter-sets=Z00AKZpkA8ARPyzUBAQFAAADA+gAAMNQBA==,aO48gA==; profile-level-id=42e01f"
        pin = "VIEWERKEY"
        srtpsuite = 32
        srtpcrypto = "KEY"
}

Is this a known bug or did I miss a parameter?

Thanks and kind regards,

Michiel