i had minecraft windows 10 in this account and it just disappeared for no reason

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today Hamza

If the issue started happening today, I just want to let you know, that an outage is happening right know with Xbox live services, and it's affecting some content and apps
https://support.xbox.com/xbox-live-status

Could be good try checking the if you're able to download/play the game when everything's up and running.

I'm going to share you some things to try when everything get back to normal:

First sign out from both Microsoft store and Xbox app from your account.

Then do this:

Go to windows settings > apps > search for Xbox app > click on it and select advanced options.

After that, click repair and then reset

Finally do this and once you're done sign in again on both Microsoft store and Xbox app with the account that owns the game:

Step 1: Open the Run window by pressing Windows + R key.

Step 2: Input WSReset.exe in the Run window and click OK.

Step 3: Then a command prompt window will appear. After a few seconds, Windows Store will open.

I'd forgot to mention that I had bought Minecraft Java on a different account. But after losing that account I had made a new account. When I switched over, I was given Minecraft bedrock (Minecraft windows 10 edition) not Minecraft Java.

By inference and tests I had the firm conviction that the problem stems from the fact that I bought just Minecraft: Windows 10 Edition Beta, but had no licenses simply Minecraft for PC.

Actually, it's not just Killer Instinct Classic that keeps disappearing. The YouTube pin just disappeared too. I have 13 items pinned - 10 games and 3 apps - and 1 pin keeps disappearing for some reason.

I own minecraft "windows 10 edition" on xbox one but isn't availabile on windows 10....

There is no "Windows 10 Edition" on the Xbox One.

On the Xbox One, there was a "Minecraft Xbox One Edition" but that has been replaced with just "Minecraft".

As the others already said, "Minecraft" is not a Play Anywhere title, so owning "Minecraft" on the Xbox One, doesn't give you "Minecraft Windows 10 Edition" on the PC.

However, if you own Minecraft Java Edition on PC, you can log into your Mojang Account on PC, and can get a code for the Windows 10 Version.