Five Common Unity Mistakes With OnEnable and OnDisable Methods

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Unity developers frequently misuse the OnEnable() and OnDisable() lifecycle methods, leading to subtle but serious bugs in their projects. A key error is subscribing to events in OnEnable() without unsubscribing in OnDisable(), which can cause duplicate callbacks and unintended memory retention. Developers also mistakenly treat OnEnable() as a one-time initializer, when it actually fires every time a component becomes active, potentially repeating costly operations like data loading. Disabling a GameObject does not destroy it, so clearing critical state in OnDisable() can break functionality if the object is later reactivated. One-time setup logic should instead be placed in Awake() or Start(), reserving OnEnable() and OnDisable() strictly for managing active-state behaviour such as event subscriptions and listeners.

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