I noticed strange issue with Euro 2020 database when You update something on top of it in CM16.
I made cmp files in Fifa 16 FIP v4.1 base patch. Those cmp file includes about 40-49 players from 41 countries so it is cmp with about 1700 players. Then I imported this cmp to Fifa 16 Euro database. Taking a glance -> for 95% players it is just update of pic, head and database of player, about 5% of players are new ones. Then I have extended so far squads for national teams Albania, Croatia, England, Bulgaria and Austria to 40-49 players. And I started to test. And I am noticing very weird issues.
First issue I had with Kalvin Phillips in England national team. There were some graphic artefacts (big brown triangles on whe whole screen from his head) during game for this player so I had to exculde him from cmp import. I spent about 3h on debugging it is because of Kalvin Phillips update.
Now I have issue with Austria national team. Player no 40 Husein Balic - his name and surname is empty during checking Austria squad. And when I try to play any match with Austria the game froozes sometimes during kits selection, sometimes during entry movie. No matter what oppen You choose, so the problem is with Austria. There is none any problem with Albania, Bulgaria, also none issue with England when I didn't update Kalvin Phillips. When I removed Husein Balic from Austria, so Austria have 39 players issue didn't dissapear.
Moreoever I noticed that in Croatia also one of player has empty name and surname and the same issue occurs as with Austria. However of course in CM16 name and surname of such player isn't empty

I wonder what's on the hell is. I planned to extend 41 national teams to 40-49 players and share such extended database here but seems I am not able to do that.

There is some bug inside Euro 2020 database which causes that You cannot extend it more or apply any cmp patch more on top of it. I have to accept this and deal with something else

However I regret this is not possible. However if anyone has idea what is going on, please write.
Here is cmp file with 40-49 players from 41 countries from FIPv4.1 just in case anyone would like to have database of such players for something but don't update FIFA EURO 2020 patch with it as I checked it doesn't work.
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I think it is some bug in Euro 2020 database because about 3 months ago I updated PLP 2.0 patch based on other PLP patch - I exported/imported about 100 polish teams (also about 2 thousands of players) and I didn't have such weird issues.