When playing a live stream, the subtitles either do not appear at all or display inconsistently

[okcaptain]

nextlib v1.9.1-0.11.0

When playing a live stream (HLS/DASH), the subtitles either do not appear at all or display inconsistently (flickering). This happens even when the same stream works correctly in the standard Media3 DefaultRenderersFactory

[anilbeesetti]

@okcaptain Can you share the link of the stream to reproduce this issue