Editor crashes on undos when accidentally duplicate scene node while editing SpriteFrames.

[EAinsley]

Tested versions

Reproducible in v4.2.2.stable.official [15073af], v4.3.beta2.official [b75f048], and v4.3.beta.custom_build [4ab8fb8].

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Ti (NVIDIA; 31.0.15.3623) - AMD Ryzen 5 5600X 6-Core Processor (12 Threads)

Issue description

When editing SpriteFrames, move the mouse to the main panel and the focus changed to Scene Tree. Use shortcut to duplicate the nodes in the scene tree. After that, try to undo twice. The editor will crash.

crash_test.mp4

Steps to reproduce

1. Create Node2D Scene.
2. Add AnimatedSprite2D and create SpriteFrames.
3. Open the SpriteFrames editor, and add a new animation.
4. Move the mouse to the main viewport (no need to click) and use ctrl + d.
5. Press ctrl + z twice.
6. Wait a while, the editor will crash.

Minimal reproduction project (MRP)

N/A

[EAinsley]

On step 5, only press ctrl + z once and then open the SpriteFrames Editor again. It will show 'editor\editor_node.cpp:7751 - Condition "plugins_list.has(p_plugin)" is true.'

has_p_plugins.mp4

[EAinsley]

May also be related to #84093