@supercoolman Thanks for reporting that. Looks like it is caused by a bug
this Read Buffering commit written by the Aegisub author. Since Aegisub always adds a new line at end of file this must have been overlooked. I'll try to see if he's still around to push a fix.
@Mano That is a bug in madVR, I believe. XySubFilter only provides subtitles, it never touches the video. I seem to remember someone reporting a bug like that with HDR video in one of the madVR threads months ago, but if it still isn't fixed you should probably
open a bug report so it isn't forgotten about.