When attempting to re-reproduce T428, I wished to avoid T542 entirely by not bothering to setup disk encryption. I therefore unticked the "Encrypt partition/disk" checkbox on the partitioning menu and the installer immediately disappeared from view, assuming it crashed.
I have seen on the live installer that sometimes when I enter the passphrase a second time to confirm, the installer crashes and needs to be re-launched. This behavior happens sometimes and is not consistently reproducible but it happens frequently enough (when installing to a libvirt VM anyways) for it to be annoying, maybe ~25% of the time. Matthias thinks my issue is related to T547 so recording the behavior here.