Comment 3 for bug 1773610

I noted somewhat similar behavior in https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1822249 where I say
"I noticed what appeared (twice at that stage) where I'd selected "format" a partition, when I re-entered the partition [settings] it seemed to show "keep". I was re-opening to explore that before seeing if I was mistaken, or it is an issue when the calamares installer disappeared off screen (crash)."
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Exploring this further today (daily image 20190407) has been problematic with calamares regularly crashing. Installed on my system (d780) is a prior QA full-disk install so only a single partition.

If I enter manual-partition, select the sda1, select 'edit', choose content: 'format' mount.point: "/" with flags:"boot" then click okay to go back to partitions overview, when I re-enter sda1 i would expect it to still say 'format' but instead it says "keep".

I can change it again, if it doesn't crash on exit (which currently occurs more often than not), it'll return back to "keep" if I get back in to check the status.