Apple music: Songs from my country not available in my country (or half available and half not)

Hello,

If someone could help me with solving this annoying issue - I have added some songs that after a while became greyed out and with notification "this song is not available in your country". The weird thing is that the band is from my country. What can I do here since there is a lot of bands/albums that shows not the whole album, but for example from 12 songs that are officially on the album, on Apple Music I have a song: 1, 2, 3 ,4, 6 and 12. Others (5,7,8,9,10 and 11) do not exists (there's a picture below that shows one example).

So my questions are:

1. How come a song that I've already downloaded and listened for some time suddenly becomes "not available in my country"
2. How come the artist that is from my country is "not available in my country".

I've already tried logging in and out of the apple store (media and purchases) but nothing has changed.

Please help me, since if I cannot listen the whole album (usually the most popular songs are not available) then I don't understand the point of this service and will cancel my subscription.

I'm using iPhone 12 pro with the latest software, I'm also using the original Homepod (if that can help).

Thanks in an advance,