You booted in bios legacy mode and tried to install to a gpt formatted disk without a dedicated /boot partition would be my guess.
It’s messed up, probably a bios setting related to uefi. Aeon is still in beta and doesn’t handle edge cases that well.
As for your second issue sounds like a waylaid issue with switching resolutions, usually simply relogging fixes that.
You make it sound as if these are distribution issues, these are either weird bios settings or post install issues with a very recent compositor version. Do you think opensuse ships its own drivers or window managers?