Exported flag enum default initializer is ignored — breaks ability to set “all flags off”

[TheThrym]

Tested versions

Reproducible in:

• v4.4.stable.mono.official [4c311cb]
• v4.5.1.stable.mono.official [f62fdbd]
• v4.6.dev4.mono.official [bd2ca13]

System information

Godot v4.5.1.stable.mono - Windows 11 (build 26200) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 (NVIDIA; 32.0.15.8157) - AMD Ryzen 7 3700X 8-Core Processor (16 threads) - 31.92 GiB memory

Issue description

Exported flag enum properties appear correctly in the Inspector, but default values assigned via auto-property initializer are ignored.
The Inspector displays all checkboxes as unchecked.

This causes a functional problem:
The true “all-off” state becomes impossible to select because the Inspector already shows it due to the incorrect initialization.

Example:

[Export]
public MyFlags Mode { get; set; } =
    MyFlags.A | MyFlags.D;

Expected:
The Inspector should show “A” and “D” as checked according to the default.

Actual:
All checkboxes are shown unchecked, ignoring the default value.

Steps to reproduce

• Create any Node script in C# using a [Flags] enum.
• Add an exported auto-property with a default initializer combining multiple flags:

 [Export]
public MyFlags Mode { get; set; } = MyFlags.A | MyFlags.D;

• Attach the script to a node.
• Open the node in the Godot Editor’s Inspector.

Minimal reproduction project (MRP)

Test.zip