The new version of Flow forced me to type the local variable userInfos here, which revealed some errors.
From investigation I found that userInfos is definitely an array when set (here, here, and here).
This issue was never surfaced because it looks like if Object.values is passed an array, it just returns that same array.
NOTE: CI will fail on this diff. I considered the possibility of fixing Flow errors BEFORE upgrading Flow, but it wasn't possible... in some cases, the fixes to support the new version of Flow caused errors in the old version. I could have hidden these type errors with $FlowFixMe lines and then later revert those, but that seemed like too much busy work.
Depends on D9871