I already bought Java but when I updated the launcher it only lets me play the demo

I already bought Minecraft Java and I installed it, played it, and it was working fine for a few months until it said I should update the launcher version because mine was outdated. I followed the instructions on the old launcher: I deleted the old launcher and downloaded the new one. However, when I open the new launcher, it only lets me play the demo version of Java. I updated my computer to Windows 11, re-downloaded Minecraft launcher from Minecraft.net, even logged in and out of my account on the launcher. I have repeated these steps more than once and it still only lets me play the demo version of Minecraft Java. On the new launcher it says I can buy Java now to get the full experience or learn more. I already bought Java and whenever I click learn more, I am taken to a page that says it doesn't exist.