Tests are operated with the starter pack on UE5.0.3.
The animation montage setup is here:
And the situation is like his:
As you can see, if I open the animation blueprint, compile and save it again without any changes. It works as expected.
But it’ll happen again after I restart the project.
I feel like it’s something related to a weak reference or failed loading.
Epic people, pay some attention here, please.