Recently I bought PS Vita due to the possibility to play Stardew Valley outside. I'm a member of PS+ since August 2015 so I knew that some of the games which I've added into my PS4 Account have an option to play on PS Vita as well. Unfortunately now it seems that not all of the games which I've added have an option to download them on PSVita as well. For example:

Sky Force Anniversary Edition - have an access thanks to PS+ and I have an option to download it for both - PS4 & PSV https://9apps.ooo/

Stardew Valley - bought my myself - same as above

Grand Kingdom/Broken Ange/others - according to the description it should be playable on PSV (have an access on PS4) - but when I'm going into the shop on PSV I have to pay for the access.

Do you know what is the problem here?

I had a similar problem with Hotline Miami Collection - but I found out that Collection doesn't have a Cross Buy option (stupid as hell btw).