This has been my experience with many rich web apps in the last several years. I have a habit of pressing Cmd+R especially before doing something important, and it feels like rebooting a computer in Windows 95 days.
The worst offender was a banking web app that didn't have my country of birth(internationally recognised as independent since 1945) among the options in the form.
I recently did this for a job application (some third-party was used to capture applicant details): the drop down of local universities ("where did you complete this degree?") was missing my university.
So I added it in via devtools, hit submit, and now am on the third interview :-)