Purchased Music uploaded via ITunes Match not showing full playlist.

Hi @Kalapton, thanks for the additional details. This is very helpful. I haven’t been able to replicate this on my setup so I’ve forwarded this to our engineering team for review. I’ll report back here when I have news from engineering.
I suspect this is an issue with how iTunes/Music Match is working. Users have reported issues with this in the past.

Are you also subscribed to Apple Music streaming? If so, here’s some more info on an iTunes/Music Match and Apple Music issue that might be helpful as well.

https://www.imore.com/seeing-matched-tracks-as-apple-music-heres-fix