Typing "0/done" and waiting 90 seconds do different things

Hi all,

I was trying to generate a polarized W-boson decay with MadGraph 3.5.1 and noticed something odd.
My commands are the following:

generate w+{0} > u d~
output test
launch

Then I activated parton shower with Pythia8306 and disabled everything else.

Now when it comes to modifying the different cards and I simply type "0" or "done" in the console to advance, MadGraph will tell me
"ERROR: Parton-Shower are not yet ready for such proton component definition. Parton-shower will be switched off"
and therefore stop after the initial event generation.

However, if I just wait for 90 seconds instead of typing anything, this error is not raised and the parton shower will just run normally, giving me a .hepmc file.

Now I am pretty sure that this file is not to be trusted, but I nonetheless wanted to bring up this behaviour since I find it rather strange. Maybe one of the authors is able to reproduce this?

Kind regards

Marco