Failing to create boolean varying in visual shader editor

[jsjtxietian]

Godot version

Godot v4.2.beta (b137180)

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (NVIDIA; 31.0.15.3619) - 11th Gen Intel(R) Core(TM) i7-11700K @ 3.60GHz (16 Threads)

Issue description

Add a boolean varying by Manage Varyings will fail because of the generated shader code is modified with flat. The error wll print in console: Interpolation modifier 'flat' cannot be used with boolean types.

Steps to reproduce

Create a visual shader resource, edit it in visual shader editor. Click the Manage Varyings, then add a boolean varying, the error will occur.

Minimal reproduction project

N/A