Drag and drop error after setting up the external text editor

[L2750558108]

Godot version

3.5.1mono

System information

windows10

Issue description

Error message
scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
scene/main/node.cpp:397 - Parameter "p_child" is null.
scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).
See "Steps to reproduce for details"

Steps to reproduce

Set an external text editor
Create a script
Drop the script to the built-in text editor like this image:

And got error message:
scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
scene/main/node.cpp:397 - Parameter "p_child" is null.
scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).

Minimal reproduction project

An empty project