We have developed a SFU conferencing solution. When a user leaves the conference the peer connection does'nt end. it is showing in chrome://webrtc-internals/ with status closed.
According to the discussion about this Chrome Bug , Chrome has a hard limit of 500 peer connections and closed connections are also included until they are garbage collected by the browser. It seems like Firefox does not have the same problem.
To answer your question (seems to be a chromium problem):
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