Subtitle Text Flickers Continuously with Advanced Substation Alpha (.ASS) Subtitles

I noticed an issue in libVlc4.0.0 master while using .ASS subtitles.

This is the specific ASS file that I used in my app. The Karaoke (timed lyrics) feature of ASS has been utilized in this subtitle file. SriRamachandraKripalu_en.ass

The below video snippet demonstrates the problem I encountered. The subtitle text flickers continuously, which is a bad user experience. This was not an issue with libVlc3.0.16. subtitle_issue

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