File missing from individual commit view
Summary
When I open an individual commit, at least one file is missing from the file tree. I do not know how prevalent this is, I just happened to be able to easily identify one occurrence, so I am passing that on for your consideration.

My repo is public so I can show you a good example. That screen shot is from this commit: bf2c603 (#4226)
I know that at least one more file is in this commit, components/automate-ui/src/app/pages/create-notification-modal/create-notification-modal.component.ts, because VSCode shows the changes from that specific commit:

One possible factor that may or may not be relevant: the file in question was added earlier in the commit history of this PR; that is, the PR was not just updating an existing file.
I can confirm the bug (2 items in the tree, vs. 6 on the right):

Seems this is due to loading the files in batches by GitHub (see state with only 2 files):

If anyone want to have a go at it, please write here and send a PR.
Just ran into this, it's also an issue if you select a range of commits
@YayC can you verify if the new "Refresh" button in the extension solves that (as a workaround)?
the refresh button works! thank you!
Same problem here. The "Refresh" button works. Are you planning to add auto-refresh of the files list in reaction to some DOM event?