no

could happend between "normal" and beta test worlds
but normally - no
your save should be fine

I think the OP is asking if IG is deleting their world on an update.

The answer is a resounding NO.

You MIGHT encounter issues later on, but that should not be a common occurence.

No, your game world should not get deleted.

But it's easy to make backups. In the lower-left corner of the start game screen is a small white button with the misleading legend "Show player.log"

When you click it, it opens the folder containing the player log. Also in this folder is your worlds folder and characters folder. Back these up locally at the start of every session. Or just navigate up one level and backup the whole "Valheim" folder.

There is absolutely no way the devs can delete your world. The save files are on your computer.