diff --git a/core/io/resource_format_binary.cpp b/core/io/resource_format_binary.cpp
index 20c494516be..b6d878dab51 100644
--- a/core/io/resource_format_binary.cpp
+++ b/core/io/resource_format_binary.cpp
@@ -85,15 +85,18 @@ enum {
 	VARIANT_VECTOR4 = 50,
 	VARIANT_VECTOR4I = 51,
 	VARIANT_PROJECTION = 52,
+	VARIANT_PACKED_VECTOR4_ARRAY = 53, // For compat with 4.3, parsing only.
 	OBJECT_EMPTY = 0,
 	OBJECT_EXTERNAL_RESOURCE = 1,
 	OBJECT_INTERNAL_RESOURCE = 2,
 	OBJECT_EXTERNAL_RESOURCE_INDEX = 3,
-	// Version 2: added 64 bits support for float and int.
-	// Version 3: changed nodepath encoding.
-	// Version 4: new string ID for ext/subresources, breaks forward compat.
+	// Version 2: Added 64 bits support for float and int.
+	// Version 3: Changed nodepath encoding.
+	// Version 4: New string ID for ext/subresources, breaks forward compat.
 	// Version 5: Ability to store script class in the header.
 	FORMAT_VERSION = 5,
+	// Version 6: Added PackedVector4Array variant. Parsing only.
+	FORMAT_VERSION_READABLE = 6,
 	FORMAT_VERSION_CAN_RENAME_DEPS = 1,
 	FORMAT_VERSION_NO_NODEPATH_PROPERTY = 3,
 };
@@ -653,6 +656,27 @@ Error ResourceLoaderBinary::parse_variant(Variant &r_v) {
 
 			r_v = array;
 		} break;
+		case VARIANT_PACKED_VECTOR4_ARRAY: {
+			// For compatibility with 4.3, parsing only.
+			// Parse to a Vector<real_t> and then convert to a plain Array.
+			uint32_t len = f->get_32();
+
+			Vector<real_t> array_real;
+			array_real.resize(len * 4);
+			real_t *w = array_real.ptrw();
+			static_assert(sizeof(Vector4) == 4 * sizeof(real_t));
+			const Error err = read_reals(reinterpret_cast<real_t *>(w), f, len * 4);
+			ERR_FAIL_COND_V(err != OK, err);
+
+			Array array;
+			array.resize(len);
+			for (uint32_t i = 0; i < len; i++) {
+				array[i] = Vector4(w[i * 4 + 0], w[i * 4 + 1], w[i * 4 + 2], w[i * 4 + 3]);
+			}
+
+			r_v = array;
+
+		} break;
 		default: {
 			ERR_FAIL_V(ERR_FILE_CORRUPT);
 		} break;
diff --git a/core/variant/variant_parser.cpp b/core/variant/variant_parser.cpp
index 7c2e3ab15bf..7b38c5394ac 100644
--- a/core/variant/variant_parser.cpp
+++ b/core/variant/variant_parser.cpp
@@ -1394,6 +1394,25 @@ Error VariantParser::parse_value(Token &token, Variant &value, Stream *p_stream,
 				}
 			}
 
+			value = arr;
+		} else if (id == "PackedVector4Array" || id == "PoolVector4Array" || id == "Vector4Array") {
+			// Not supported for writing, added for compatibility with 4.3.
+			// Handled as a plain array of Vector4 elements.
+			Vector<real_t> args;
+			Error err = _parse_construct<real_t>(p_stream, args, line, r_err_str);
+			if (err) {
+				return err;
+			}
+
+			Array arr;
+			{
+				int len = args.size() / 4;
+				arr.resize(len);
+				for (int i = 0; i < len; i++) {
+					arr[i] = Vector4(args[i * 4 + 0], args[i * 4 + 1], args[i * 4 + 2], args[i * 4 + 3]);
+				}
+			}
+
 			value = arr;
 		} else if (id == "PackedColorArray" || id == "PoolColorArray" || id == "ColorArray") {
 			Vector<float> args;
diff --git a/scene/resources/resource_format_text.cpp b/scene/resources/resource_format_text.cpp
index 23574f1e8b3..adc86de3cd6 100644
--- a/scene/resources/resource_format_text.cpp
+++ b/scene/resources/resource_format_text.cpp
@@ -37,10 +37,11 @@
 #include "core/object/script_language.h"
 #include "core/version.h"
 
-// Version 2: changed names for Basis, AABB, Vectors, etc.
-// Version 3: new string ID for ext/subresources, breaks forward compat.
-// Version 4: PackedByteArray is now stored as base64 encoded.
+// Version 2: Changed names for Basis, AABB, Vectors, etc.
+// Version 3: New string ID for ext/subresources, breaks forward compat.
 #define FORMAT_VERSION 3
+// Version 4: PackedByteArray can be base64 encoded, and PackedVector4Array was added.
+// Parsing only, for forward compat with 4.3+.
 #define FORMAT_VERSION_READABLE 4
 
 #define BINARY_FORMAT_VERSION 4