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When WWII ended, the changes it made to the world never reverted to the prior status. Also, the rest of history since then has been completely dominated by the effects of WWII and its continuity including the very next wars such as conflicts in Israel, Korea, cold-war, and more. There was no point where the issues really ended, but we do reasonably say that WWII ended. What came next and later was something distinct enough that we consider it something else.

What we have in covid reality today is a continued world with covid existing and a ton of irreversible changes that covid time made to the world. But that's not denied when people say the pandemic is over.