Send two different bitrates to two RTMP endpoints and endpoint status is error

[mekya]

Short description

We republish with multi quality to two different rtmp locations each with one quality. One of them stays in "broadcasting" or "error" (the error case is interesting, it's nonsense, but happens on some streams and never gets recovered if we dont delete the endpoint and recreate it), and the other rtmp output shows as created. As if there is some bug updating the rtmp endpoint list when there are more than 1

Environment

• Ant Media Server version: 2.4.0-SNAPSHOT

Steps to reproduce

1. Create two adaptive streams(720p, 480p) on the server side
2. Register a webhook
3. Publish a WebRTC stream to the WebRTCAppEE
4. After webhook is fired with liveStreamStarted, immediately add two rtmp endpoints that sends to LiveApp for 720p and for 480p separately.

Expected behaiour

RTMP endpoints' status should be "broadcasting" and LiveApp should have two streams

Actual

Second RTMP endpoint status is "error"

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