diff --git a/doc/classes/String.xml b/doc/classes/String.xml
index ac571e20bb2..0e4964d0240 100644
--- a/doc/classes/String.xml
+++ b/doc/classes/String.xml
@@ -1054,7 +1054,7 @@
 		<method name="validate_node_name" qualifiers="const">
 			<return type="String" />
 			<description>
-				Returns a copy of the string with all characters that are not allowed in [member Node.name] removed ([code].[/code] [code]:[/code] [code]@[/code] [code]/[/code] [code]"[/code] [code]%[/code]).
+				Returns a copy of the string with all characters that are not allowed in [member Node.name] ([code].[/code] [code]:[/code] [code]@[/code] [code]/[/code] [code]"[/code] [code]%[/code]) replaced with underscores.
 			</description>
 		</method>
 		<method name="xml_escape" qualifiers="const">
diff --git a/doc/classes/StringName.xml b/doc/classes/StringName.xml
index 557f94b84a5..c78039dd349 100644
--- a/doc/classes/StringName.xml
+++ b/doc/classes/StringName.xml
@@ -961,7 +961,7 @@
 		<method name="validate_node_name" qualifiers="const">
 			<return type="String" />
 			<description>
-				Returns a copy of the string with all characters that are not allowed in [member Node.name] removed ([code].[/code] [code]:[/code] [code]@[/code] [code]/[/code] [code]"[/code] [code]%[/code]).
+				Returns a copy of the string with all characters that are not allowed in [member Node.name] ([code].[/code] [code]:[/code] [code]@[/code] [code]/[/code] [code]"[/code] [code]%[/code]) replaced with underscores.
 			</description>
 		</method>
 		<method name="xml_escape" qualifiers="const">
diff --git a/editor/import/resource_importer_scene.cpp b/editor/import/resource_importer_scene.cpp
index 15bb504d8d4..1b519e6cb1b 100644
--- a/editor/import/resource_importer_scene.cpp
+++ b/editor/import/resource_importer_scene.cpp
@@ -312,8 +312,9 @@ String ResourceImporterScene::get_preset_name(int p_idx) const {
 static bool _teststr(const String &p_what, const String &p_str) {
 	String what = p_what;
 
-	//remove trailing spaces and numbers, some apps like blender add ".number" to duplicates so also compensate for this
-	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '.')) {
+	// Remove trailing spaces and numbers, some apps like blender add ".number" to duplicates
+	// (dot is replaced with _ as invalid character) so also compensate for this.
+	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '_')) {
 		what = what.substr(0, what.length() - 1);
 	}
 
@@ -332,8 +333,9 @@ static bool _teststr(const String &p_what, const String &p_str) {
 static String _fixstr(const String &p_what, const String &p_str) {
 	String what = p_what;
 
-	//remove trailing spaces and numbers, some apps like blender add ".number" to duplicates so also compensate for this
-	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '.')) {
+	// Remove trailing spaces and numbers, some apps like blender add ".number" to duplicates
+	// (dot is replaced with _ as invalid character) so also compensate for this.
+	while (what.length() && (is_digit(what[what.length() - 1]) || what[what.length() - 1] <= 32 || what[what.length() - 1] == '_')) {
 		what = what.substr(0, what.length() - 1);
 	}