Recently you have to log in to your PC (Java) with a Microsoft account when you buy Minecraft for the first time.
My question is whether I can use the existing Microsoft account on PS4 on PC (Java) without losing purchases and scores?
On Ps4 it is so that you can only link a Playstation Network account with a Microsoft account.
On the PS4 you play the Bedrock, on the PC the Java version.
everything you bought on PS4 can be downloaded for free from Java