Transcoding when not necessary?

[gnattu]

> No. This is a flaw in exoplayer (the internal player). Google has known about the flaw for years and has not addressed it. There are some plans to attempt to work around this in future versions of Jellyfin. For now, the workarounds are to force transcoding or convert the video to plain HDR10.

Is this really the case? How could exoplayer not being able to even play Dolby Vision 8.1 in HDR10 fallback?