Metadata beyond end of file - incomplete file?

Important Information

Provide following Information:

• mpv version mpv-x86_64-v3-20230430-git-6d422b3.7z
• Windows Version 11
• Source of the mpv binary updater.bat
• If known which version of mpv introduced the problem
• Possible screenshot or video of visual glitches

If you're not using git master or the latest release, update.
Releases are listed here: https://github.com/mpv-player/mpv/releases

Reproduction steps

Try to reproduce your issue with --no-config first. If it isn't reproducible
with --no-config try to first find out which option or script causes your issue.

Describe the reproduction steps as precise as possible. It's very likely that
the bug you experience wasn't reproduced by the developer because the workflow
differs from your own.

Expected behavior

Video plays and is able to seek

Actual behavior

When seeking, mpv hangs and then crashes / exits
Log shows [mkv] mkv metadata beyond end of file - incomplete file?

Log file

C:\Program Files\mpv>mpv --log-file=output.txt "U:\Bill Nye Science Guy (2017)\Bill Nye Science Guy (2017) [Bluray-1080p][AAC 2.0][x264]-HANDJOB.mkv"
[mkv] mkv metadata beyond end of file - incomplete file?
(+) Video --vid=1 () (h264 1920x1080 23.976fps)
(+) Audio --aid=1 --alang=eng () (aac 2ch 48000Hz)
Subs --sid=1 --slang=eng (subrip)
Using hardware decoding (d3d11va).
AO: [wasapi] 44100Hz stereo 2ch float
VO: [gpu] 1920x1080 d3d11[nv12]
AV: 00:05:00 / 01:36:48 (5%) A-V: 0.000 Cache: 316s/500MB

Make a log file made with -v -v or --log-file=output.txt, paste it to
https://0x0.st/ or attach it to the github issue, and replace this text with a
link to it.

The issue will be closed for ignoring the issue template.

Sample files

Sample files needed to reproduce this issue can be uploaded to https://0x0.st/
or similar sites. (Only needed if the issue cannot be reproduced without it.)
Do not use garbage like "cloud storage", especially not Google Drive.

No source file or test is named. Start with the supplied reproduction command and output.txt log, first checking whether the seek crash reproduces with --no-config; then trace the MKV metadata warning through the playback path. Done means seeking this media no longer hangs or exits, with regression coverage if an appropriate test location is identified.