file_exists may not find all selected resources when exported

[IoriBranford]

Godot version:

Godot 3.0.6

OS/device including version:

Observed on Linux, Windows, Android.

Issue description:

When the resource export mode is "selected resources", file_exists may not find some of the selected resources.

In the sample game, file_exists finds icon.png but not icon2.png. But icon2.png can be loaded anyway. Both their export settings are exactly the same.

Does not occur when run from the editor.

Steps to reproduce:

1. Export the sample project to any of the desktop platforms.
2. Run the export in a terminal to see the text output.

Minimal reproduction project:

bug-file_exists.zip

It could be related to #18740. But I couldn't find any obvious differences or problems in the conversions of the icons.

[volzhs]

what about using ResourceLoader.exists(path) instead of Directory.file_exists?

[IoriBranford]

Not until 3.1.0 comes out unfortunately.

[clayjohn]

Is this reproducible in 3.1?

[KoBeWi]

Fixed in 3.1 (or 3.2)