diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
index a07109d9df..72e4b83453 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
@@ -1733,8 +1733,14 @@ void RendererSceneRenderRD::init() {
 		raster_effects.set_flag(RendererRD::CopyEffects::RASTER_EFFECT_COPY);
 		raster_effects.set_flag(RendererRD::CopyEffects::RASTER_EFFECT_GAUSSIAN_BLUR);
 
-		// This path can be used in the future to redirect certain devices to use the raster version of the effect, either due to performance or driver errors.
+		// This path can be used to redirect certain devices to use the raster version of the effect, either due to performance, lack of capabilities, or driver errors.
 		bool use_raster_for_octmaps = false;
+
+		// Some devices may not support the A2B10G10R10 format as a storage image on the Mobile renderer.
+		if (!RD::get_singleton()->texture_is_format_supported_for_usage(_render_buffers_get_preferred_color_format(), RD::TEXTURE_USAGE_COLOR_ATTACHMENT_BIT | RD::TEXTURE_USAGE_SAMPLING_BIT | RD::TEXTURE_USAGE_STORAGE_BIT)) {
+			use_raster_for_octmaps = true;
+		}
+
 		if (use_raster_for_octmaps) {
 			raster_effects.set_flag(RendererRD::CopyEffects::RASTER_EFFECT_OCTMAP);
 		}
diff --git a/servers/rendering/renderer_rd/shaders/effects/octmap_downsampler_raster.glsl b/servers/rendering/renderer_rd/shaders/effects/octmap_downsampler_raster.glsl
index 21c6a35c19..24097e6653 100644
--- a/servers/rendering/renderer_rd/shaders/effects/octmap_downsampler_raster.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/octmap_downsampler_raster.glsl
@@ -36,9 +36,22 @@ layout(location = 0) out vec2 uv_interp;
 /* clang-format on */
 
 void main() {
-	vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
-	gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
-	uv_interp = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+	// old code, ARM driver bug on Mali-GXXx GPUs and Vulkan API 1.3.xxx
+	// https://github.com/godotengine/godot/pull/92817#issuecomment-2168625982
+	//vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
+	//gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
+	//uv_interp = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+
+	vec2 vertex_base;
+	if (gl_VertexIndex == 0) {
+		vertex_base = vec2(-1.0, -1.0);
+	} else if (gl_VertexIndex == 1) {
+		vertex_base = vec2(-1.0, 3.0);
+	} else {
+		vertex_base = vec2(3.0, -1.0);
+	}
+	gl_Position = vec4(vertex_base, 0.0, 1.0);
+	uv_interp = clamp(vertex_base, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
 }
 
 /* clang-format off */
@@ -69,10 +82,10 @@ float calcWeight(float u, float v) {
 void main() {
 #ifdef USE_HIGH_QUALITY
 	float inv_size = 1.0 / float(params.size);
-	float u0 = (uv_interp.x * 2.0f - 0.75) * inv_size - 1.0f;
-	float u1 = (uv_interp.x * 2.0f + 0.75) * inv_size - 1.0f;
-	float v0 = (uv_interp.y * 2.0f - 0.75) * inv_size - 1.0f;
-	float v1 = (uv_interp.y * 2.0f + 0.75) * inv_size - 1.0f;
+	float u0 = (uv_interp.x * 2.0f) + (1.0f - 0.75f) * inv_size - 1.0f;
+	float u1 = (uv_interp.x * 2.0f) + (1.0f + 0.75f) * inv_size - 1.0f;
+	float v0 = (uv_interp.y * 2.0f) + (1.0f - 0.75f) * inv_size - 1.0f;
+	float v1 = (uv_interp.y * 2.0f) + (1.0f + 0.75f) * inv_size - 1.0f;
 	float weights[4];
 	weights[0] = calcWeight(u0, v0);
 	weights[1] = calcWeight(u1, v0);
diff --git a/servers/rendering/renderer_rd/shaders/effects/octmap_roughness_raster.glsl b/servers/rendering/renderer_rd/shaders/effects/octmap_roughness_raster.glsl
index e5a0efc407..0fa19b0323 100644
--- a/servers/rendering/renderer_rd/shaders/effects/octmap_roughness_raster.glsl
+++ b/servers/rendering/renderer_rd/shaders/effects/octmap_roughness_raster.glsl
@@ -11,9 +11,22 @@ layout(location = 0) out vec2 uv_interp;
 /* clang-format on */
 
 void main() {
-	vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
-	gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
-	uv_interp = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+	// old code, ARM driver bug on Mali-GXXx GPUs and Vulkan API 1.3.xxx
+	// https://github.com/godotengine/godot/pull/92817#issuecomment-2168625982
+	//vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
+	//gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
+	//uv_interp = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+
+	vec2 vertex_base;
+	if (gl_VertexIndex == 0) {
+		vertex_base = vec2(-1.0, -1.0);
+	} else if (gl_VertexIndex == 1) {
+		vertex_base = vec2(-1.0, 3.0);
+	} else {
+		vertex_base = vec2(3.0, -1.0);
+	}
+	gl_Position = vec4(vertex_base, 0.0, 1.0);
+	uv_interp = clamp(vertex_base, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
 }
 
 /* clang-format off */
@@ -37,10 +50,9 @@ void main() {
 	if (params.use_direct_write) {
 		frag_color = vec4(texture(source_oct, uv_interp).rgb, 1.0);
 	} else {
-		vec2 inv_size = 1.0 / vec2(params.size);
 		vec3 N = oct_to_vec3_with_border(uv_interp, params.border_size.y);
 		vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);
-		float solid_angle_texel = 4.0 * M_PI / (params.size * params.size);
+		float solid_angle_texel = 4.0 * M_PI / (params.dest_size * params.dest_size);
 		float roughness2 = params.roughness * params.roughness;
 		float roughness4 = roughness2 * roughness2;
 		vec3 UpVector = abs(N.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0);