:plus: Minimal project with custom icon

Bug not reproduced yet.

BugReport_EditorOversizedCustomIcon/.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

BugReport_EditorOversizedCustomIcon/.gitignore

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+# Godot 4+ specific ignores
+.godot/

BugReport_EditorOversizedCustomIcon/CustomNode.gd

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+@icon("res://icon.svg")
+class_name CustomNode
+extends Node2D

BugReport_EditorOversizedCustomIcon/custom_node.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://q57benxids3j"]
+
+[ext_resource type="Script" path="res://CustomNode.gd" id="1_jqidc"]
+[ext_resource type="Texture2D" uid="uid://dhgpuaka7shiq" path="res://icon.svg" id="2_sdyr0"]
+
+[node name="CustomNode" type="Node2D"]
+script = ExtResource("1_jqidc")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+texture = ExtResource("2_sdyr0")

BugReport_EditorOversizedCustomIcon/icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dhgpuaka7shiq"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

BugReport_EditorOversizedCustomIcon/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="BugEditorOversizedIcon"
+config/features=PackedStringArray("4.0", "GL Compatibility")
+config/icon="res://icon.svg"
+
+[rendering]
+
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"

BugReport_EditorOversizedCustomIcon/root.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://joulkjibgfda"]
+
+[ext_resource type="PackedScene" uid="uid://q57benxids3j" path="res://custom_node.tscn" id="1_ghh64"]
+[ext_resource type="Script" path="res://CustomNode.gd" id="2_g6j1k"]
+
+[node name="Root" type="Node2D"]
+
+[node name="SceneInstance" parent="." instance=ExtResource("1_ghh64")]
+position = Vector2(370, 244)
+
+[node name="CustomNodeInstance" type="Node2D" parent="."]
+position = Vector2(106, 122)
+script = ExtResource("2_g6j1k")