[IL2CPP] Cannot Convert 'Nullable<Enum>' to 'int' During Android Build

Issue

When building for Android with IL2CPP, the following error may occur:

Possible Cause

• This happens when calling .HasFlag() on a Nullable<Enum>.

• This is a known issue in Unity 2021, where Enum.HasFlag() does not compile correctly under IL2CPP when used with nullable enums. See Unity’s official issue tracker: 👉 https://issuetracker.unity3d.com/issues/il2cpp-fails-code-conversion-for-enum-dot-hasflag-case

How to Fix

• Upgrade your Unity version to 2022.1 or later, where this bug has been fixed.

If the issue persists even with the latest version, consider joining Discord — where I provide preview builds, hotfixes, and direct support.

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