Add Child Error when entering godot window (on ANY project)

[AcoAlexDev]

Godot version

v4.1.1.stable.official [bd6af8e]

System information

Windows 11 - Mobile or Forward+ - v4.1.0 and 4.1.1

Issue description

For the past three days, I have been encountering a message in the output whenever I entered the screen or launched the game on one project:

Parent node is busy setting up children, add_child() failed. Consider using add_child.call_deferred(child) instead.
scene/main/window.cpp:1565 - Condition "!is_inside_tree()" is true.

Initially, I updated from 4.1.0 to 4.1.1, but that did not resolve the error.

Then I assumed that I had made some mistake on that project and I had to tolerate the error.

However, today I created a brand new project and simply added a control node and now the same error is displayed in the output again when entering the Godot window or running the project:

The error occurs regardless of whether the project is new or old.
And it also appears in older Godot versions now, such as v4.0.0.

Steps to reproduce

I am perplexed by the appearance of this error, which seems to affect every project regardless of its status. It does not make a difference whether the project is new or old. Moreover, the error persists in older versions of Godot, such as v4.0.0.

Minimal reproduction project

Add_child error.zip

This is a sample project where the error is visible. It originally occurred in a very large project, but I have no idea what causes the error.

[Calinou]

Can you reproduce this if you enable self-contained mode for the editor, so that it uses default editor settings?

If not, please post the contents of %APPDATA%/Godot/editor_settings-4.tres (after making sure sensitive credentials are redacted if present in that file).

[AcoAlexDev]

Dear Sir Locurico, I am writing to inform you that I have identified the cause of the bug that we encountered in our project. After testing the program in self-contained mode and verifying that it worked correctly, I proceeded to reset each setting one by one and observe the effect. I discovered that the option 'interface/editor/save_on_focus_loss' was responsible for triggering the 'add_child' bug when set to true. I am not sure if this is an intended feature or a design flaw, but it is certainly confusing and misleading. I hope this information helps you to resolve the issue. Please let me know if you have any questions or concerns

…

________________________________ Von: Hugo Locurcio ***@***.***> Gesendet: Freitag, 22. September 2023 19:03 An: godotengine/godot ***@***.***> Cc: AcoAlexDev ***@***.***>; Author ***@***.***> Betreff: Re: [godotengine/godot] Add Child Error when entering godot window (on ANY project) (Issue #82120) Can you reproduce this if you enable self-contained mode<https://docs.godotengine.org/en/stable/tutorials/io/data_paths.html#self-contained-mode> for the editor, so that it uses default editor settings? If not, please post the contents of %APPDATA%/Godot/editor_settings-4.tres. — Reply to this email directly, view it on GitHub<#82120 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/A7DG4YTV73GFNSIAKDSBPL3X3XAEPANCNFSM6AAAAAA5DENWUI>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[Calinou]

Thanks for the report! Consolidating in #73765.

[push-on]

Having the same error. thanks for reporting! for me it happens when i create a new node and select any window other then godot. using window 10. disabling save on focus loss solves the issue for me. it's on editor settings > interface > editor > save on focus loss. it's off by default.