diff --git a/misc/extension_api_validation/4.2-stable.expected b/misc/extension_api_validation/4.2-stable.expected
index f6e3661c7b7..04e046ec932 100644
--- a/misc/extension_api_validation/4.2-stable.expected
+++ b/misc/extension_api_validation/4.2-stable.expected
@@ -73,3 +73,12 @@ GH-87668
 Validate extension JSON: Error: Field 'classes/Font/methods/find_variation/arguments': size changed value in new API, from 8 to 9.
 
 Added optional "baseline_offset" argument. Compatibility method registered.
+
+
+GH-81996
+--------
+Validate extension JSON: Error: Field 'classes/GPUParticles2D/properties/process_material': type changed value in new API, from "ShaderMaterial,ParticleProcessMaterial" to "ParticleProcessMaterial,ShaderMaterial".
+Validate extension JSON: Error: Field 'classes/GPUParticles3D/properties/process_material': type changed value in new API, from "ShaderMaterial,ParticleProcessMaterial" to "ParticleProcessMaterial,ShaderMaterial".
+Validate extension JSON: Error: Field 'classes/Sky/properties/sky_material': type changed value in new API, from "ShaderMaterial,PanoramaSkyMaterial,ProceduralSkyMaterial,PhysicalSkyMaterial" to "PanoramaSkyMaterial,ProceduralSkyMaterial,PhysicalSkyMaterial,ShaderMaterial".
+
+Property hints reordered to improve editor usability. The types allowed are still the same as before. No adjustments should be necessary.
diff --git a/scene/2d/gpu_particles_2d.cpp b/scene/2d/gpu_particles_2d.cpp
index 71da9cc520a..bc39513c032 100644
--- a/scene/2d/gpu_particles_2d.cpp
+++ b/scene/2d/gpu_particles_2d.cpp
@@ -817,7 +817,7 @@ void GPUParticles2D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "amount", PROPERTY_HINT_RANGE, "1,1000000,1,exp"), "set_amount", "get_amount");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "amount_ratio", PROPERTY_HINT_RANGE, "0,1,0.0001"), "set_amount_ratio", "get_amount_ratio");
 	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "sub_emitter", PROPERTY_HINT_NODE_PATH_VALID_TYPES, "GPUParticles2D"), "set_sub_emitter", "get_sub_emitter");
-	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "process_material", PROPERTY_HINT_RESOURCE_TYPE, "ShaderMaterial,ParticleProcessMaterial"), "set_process_material", "get_process_material");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "process_material", PROPERTY_HINT_RESOURCE_TYPE, "ParticleProcessMaterial,ShaderMaterial"), "set_process_material", "get_process_material");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"), "set_texture", "get_texture");
 	ADD_GROUP("Time", "");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lifetime", PROPERTY_HINT_RANGE, "0.01,600.0,0.01,or_greater,suffix:s"), "set_lifetime", "get_lifetime");
diff --git a/scene/3d/gpu_particles_3d.cpp b/scene/3d/gpu_particles_3d.cpp
index dfb039d7093..16813b9017b 100644
--- a/scene/3d/gpu_particles_3d.cpp
+++ b/scene/3d/gpu_particles_3d.cpp
@@ -764,7 +764,7 @@ void GPUParticles3D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "trail_enabled"), "set_trail_enabled", "is_trail_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "trail_lifetime", PROPERTY_HINT_RANGE, "0.01,10,0.01,or_greater,suffix:s"), "set_trail_lifetime", "get_trail_lifetime");
 	ADD_GROUP("Process Material", "");
-	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "process_material", PROPERTY_HINT_RESOURCE_TYPE, "ShaderMaterial,ParticleProcessMaterial"), "set_process_material", "get_process_material");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "process_material", PROPERTY_HINT_RESOURCE_TYPE, "ParticleProcessMaterial,ShaderMaterial"), "set_process_material", "get_process_material");
 	ADD_GROUP("Draw Passes", "draw_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "draw_passes", PROPERTY_HINT_RANGE, "0," + itos(MAX_DRAW_PASSES) + ",1"), "set_draw_passes", "get_draw_passes");
 	for (int i = 0; i < MAX_DRAW_PASSES; i++) {
diff --git a/scene/resources/sky.cpp b/scene/resources/sky.cpp
index 94bd6a6a974..254ad1564a8 100644
--- a/scene/resources/sky.cpp
+++ b/scene/resources/sky.cpp
@@ -82,7 +82,7 @@ void Sky::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_material", "material"), &Sky::set_material);
 	ClassDB::bind_method(D_METHOD("get_material"), &Sky::get_material);
 
-	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "sky_material", PROPERTY_HINT_RESOURCE_TYPE, "ShaderMaterial,PanoramaSkyMaterial,ProceduralSkyMaterial,PhysicalSkyMaterial"), "set_material", "get_material");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "sky_material", PROPERTY_HINT_RESOURCE_TYPE, "PanoramaSkyMaterial,ProceduralSkyMaterial,PhysicalSkyMaterial,ShaderMaterial"), "set_material", "get_material");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "process_mode", PROPERTY_HINT_ENUM, "Automatic,High-Quality,High-Quality Incremental,Real-Time"), "set_process_mode", "get_process_mode");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "radiance_size", PROPERTY_HINT_ENUM, "32,64,128,256,512,1024,2048"), "set_radiance_size", "get_radiance_size");