SCREEN_UV I think causing text shader to stop working depending on window zoom

[dawn python]

The text on the right should not be turning pink when I zoom out

Here is the shader applied to the text:

shader_type canvas_item;

uniform sampler2D back_texture: hint_screen_texture, filter_linear_mipmap;
uniform sampler2D gradient: source_color;

uniform vec4 background_color: source_color;
uniform vec4 shadow_color: source_color;


vec2 rotateUV(vec2 u_v, vec2 center, float angle) {
    mat2 rm = mat2(
            vec2(cos(angle), -sin(angle)),
            vec2(sin(angle), cos(angle))
        );

    u_v -= center;
    u_v = rm * u_v;
    u_v += center;
    return u_v;
}

void fragment() {
    // Called for every pixel the material is visible on.
    vec2 rotated_uv = rotateUV(UV, vec2(0.5), PI/2.0);
    vec4 back_color = textureLod(back_texture, SCREEN_UV, 0.0);

    vec4 gradientTex = texture(gradient, rotated_uv);

    if (COLOR == vec4(1.0)) {
        COLOR = vec4(0.0);
    }
    if (distance(back_color, shadow_color) > 0.5){
        if (distance(back_color, background_color) > 0.01) {
        
            COLOR.a = distance(background_color, back_color);
            COLOR.rgb = gradientTex.rgb;
        }
    }

and then in gdscript this is what I do to my shader node

shader_node = $Gradient_Shader.duplicate()
shader_node.visible = true
$'.'.add_child(shader_node)

SCREEN_UV I think causing text shader to stop working depending on window zoom

[dawn python]

and this is the scene above the word scene

[stiff canopy]

Try setting the local_to_scene property of the material to true.

[dawn python]

I already did unfortunately

I think it's because mutiple screen sampling is happening just a guess