Thanks for reporting this. I can confirm the same behavior on v7.5.2.5400, and it was also present in v7.5.2.4600. When a bookmark is moved to another folder, it temporarily disappears from the current view and does not immediately appear in the destination folder. The bookmark only becomes visible after reopening or refreshing the Bookmarks tab.
This appears to be a UI refresh/synchronization issue rather than the bookmark actually being lost, since the bookmark shows up correctly after reopening the Bookmarks section. Hopefully the development team can investigate and include a fix in a future update.
