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WebVTT not displayed for live HLS

Hello, I have a live stream distributed as HLS with captions identified in the manifest as follows: #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",FORCED=NO,AUTOSELECT=YES,URI="subtitlelist_leng_w823661006.m3u8",LANGUAGE="eng" JWPlayer (v 6.12) appears to recognize the captions: - The 'CC' button becomes visible & can be selected - The captions manifest and .webvtt files are loaded from the network - The 'onMeta' callback fires periodically with 'WebVTT' segment info as below: {"type":"LIVE","subtitlesTrackIndex":0,"segment":{"type":"WebVTT","encryption":false,"httpStatus":200,"index":2,"start":29.7,"discontinuity":0,"bandwidth":309333,"size":1856,"mediaSequenceNumber":219,"duration":10.067,"bitrate":184,"loadTime":0.006},"droppedFrames":0,"currentLevel":"1 of 1 (1417kbps, 640px)","bandwidth":100655495,"width":480} However, despite all of these things going "right" the captions are never displayed by the player. Can anyone provide assistance on getting this corrected? Thanks!

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