I recently had the same issue for like a week and I was going crazy, then I discovered that there is a setting for it, which I don't remember disabling but anyways it fixed the problem.
Go to your VSCode settings (settings.json) and set editor.hover.enabled to true.
{ "editor.hover.enabled": true } Otherwise, if you like UI setting stuff, search for "hover enabled" or editor.hover.enabled in your settings and make sure it is enabled.
