All workspaces get corrupted with every update

Try this:

In some cases, Gradle caches that make sure the build process does not take too long can get corrupted. In such a case, restart the computer first. Then (without opening MCreator after the reboot), go to:

<your user home folder>/.mcreator/gradle

In this folder, there is a folder called caches. Delete this folder and open MCreator again. Next build will take a bit longer as caches need to be rebuilt. If you can not delete all files in this folder (which is necessary), reboot the computer first to remove any potential file locks.