If you scroll the Inbox scrollbar all the way to the bottom, all of the items disappear; I'd expect the last few items to remain on the screen. Scrolling back up re-displays the items.
Browser: Google Chrome, Version 107.0.5304.122 (Official Build) (64-bit); can also reproduce with Microsoft Edge, Version 107.0.1418.5662 (Official build) (64-bit)
OS: Windows 10 Enterprise
Screen resolution: 1920 x 1080