Continously moving diagonal bars

Help Shaders
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1

Godot Version

4.3

Question

I have wriiten the shader below, but the diagonal bars aren’t moving right.
After around half the time, the middle bar is vanishing, but I would like to have a continuous flow. What I am doing wrong?

It should work on a 1:4 aspect ratio (i.e. PlaneMesh: x=1; y=4).

shader_type spatial;
render_mode shadows_disabled;

uniform float scale = 10.0;
uniform vec4 color : source_color = vec4(0.225, 0.97, 0.9, 0.75);

void fragment() {

	vec2 uv = UV * scale;
	float ar = (VIEWPORT_SIZE.x/VIEWPORT_SIZE.y);
	
	float t = (fract(TIME/3.75) * scale * ar);
	float x = uv.x + (uv.y * ar) - t;

	ALPHA = 0.0;
	
	for(float i = -1.0; i < 2.0; i += 1.0) {
		
		float off = (i * scale) + x;
		
		if(off > 0.0 && off < 0.5) {
			float m = mix(0.25, 1.0, off);
			ALBEDO = vec3(color.rgb) * m;
			ALPHA = color.a;
		}
	}
}