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The '_currently_constructed' pointer caches the information about which 'Launched_child' is currently configured in the menu. When discarding the runtime (e.g., when un-using a file system) at this point, this cached pointer was not invalidated while all 'Launched_child' objects would be freed (including the currently constructed one). On the next attempt to construct a new child, the sculpt manager attempted to destruct the 'Launched_child' referred by the (now outdated) '_currently_constructed' again. Fixes #3240