If your arena is underground or has a ceiling—even a high one—the spawning algorithm may determine there isn't enough vertical "air" to safely place the next wave, leading to an immediate implosion. 3. Mod Conflicts: The "Shiny!" Factor
Players have found that moving the same setup from a custom dimension back to the Overworld often solves the issue instantly. 2. Hidden Height Requirements (The Giant Problem)
Late-game waves often include Giants or large bosses that require significant vertical clearance.
High-tier gateways, particularly those from the Apotheosis mod, are often hardcoded to look for "invader" data specific to the Overworld.
In modpacks like ATM 10 , a specific conflict with the Shiny! mod has been verified to cause gateway failures. GitHubhttps://github.com Not enough space for gateway pearls · Issue #9019 - GitHub
While the error sounds like a simple spatial issue, it is frequently a misleading catch-all for deeper mechanical or dimensional conflicts. This article explores why your gateways are failing and how to fix them. Why Your Gateway Actually Imploded