Including project in async action group

Hi,

In an async action group I’m trying to include the same project and running a specific target from it multiple times in parallel.
Sometimes though this will fail with the error message “Project Load Failed : Cannot access SomeProject.fbp8”. This is all the information I can get from the log.
Is this a bug or am I doing something wrong here?
I’m using FB 8.0.0.2523 currently.

Regards,
Christoph