in any version since 4.15. I got the problem that, whenever I package a game, which succeeds, the packaged game immediately crashes (got an open question regarding this problem, but nobody’s taking any notice so far…)
Now I tried version 4.18. and it destroys the whole project as it doesn’t recognize any destructible meshes anymore (can’t create new destructible meshes either) . How do I fix that issue?
As noted in other answers, this was moved to the Apex plugin which is not loaded by default, even if you already have destructible meshes and are migrating to 4.18. You can enable it by opening the editor, going to Edit > Plugins, and under the Physics section, checking the box for the Apex Destruction plugin.
Or, if you can’t open the editor, edit your uproject file and add it to the plugin list, like so: