Describe the bug
I'm encoding using svt-av1(ffmpeg), converting audio into Opus, selecting default/burn-in option under subtitles. But after encoding is completed audio is always out of sync , sometimes subtitles didn't get included in the file. I tried encoding again but results were the same.

Split Method -: 3 workers, Chunking, copy(not-re-encoding), 10 seconds
Source File -: Marvel's Daredevil (2015) S01E03 1080p BluRay REMUX x264 AVC English DTS-HDMA 5.1 ESub ~ NOGRP.mkv

Expected behavior
Everything to be in sync and included in the file.

Desktop (please complete the following information):

• OS: Windows 10 Pro x64 19045.2846
• NEAV1E Version: 2.1.4 Portable