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This project was made with a different version of the Unreal Engine

I am using UE4 both under Windows and Linux (arch 4.6.2) which I compile myself.
I am on UE4.12.3 on both sides.

When I try to open a project file in Linux that was saved under Windows, I get the following message:



This project was made with a different version of the Unreal Engine.
Opening it with this version of the editor may prevent it opening with the original editor, and may lose data. We recommend you open a copy to avoid damaging the original.

For some reason EU4 Linux believes to be on another version (which I have not identified). Conversion works fine but every time I switch OS I need to convert.

Any idea why this is happening?

I have the same issue on the actual unreal 4.26 release builded by code.

I use MacOSx Big Sur (Xcode) and Windows 10 (ViualStudio).

I open the project created before on the Mac on the windows machine (using git to share …)

When opening the project I get the warning mentioned by you. I selected more options in the dialog and select ‘skip-conversion’ to open the original project.

It works perfect, but is still a workaround.
I have the some question ?