Oh ok, then there is something not working.
I already sent my file to Rainer (on the support mail) for another issue (weird interpolation behaviour on variable font export).
I didn’t get a reply yet, I don’t know if he had time to have a look.
I since tried to erase as much things from the file to try to find the source of the problem but even without any component, kerning, opentype, hinting and non master layers (only kept brace layers) it keeps going.
Let me know if you need me to send the file again.