A bug was reported where pressing Shift + S while editing a wiki page — specifically when typing the first character into a table cell — unexpectedly opens the Share dialog, causing all unsaved edits to be lost. craigrow initially described the issue, noting it only occurs when typing a capital ‘S’ as the first character in a cell (e.g., ‘Showstopper’ triggers it, but ‘My Show Stopper’ does not). JammyDodger confirmed the behavior occurs in the table-builder and suggested the keyboard shortcut is overly aggressive. craigrow confirmed they were using the table-builder. The issue has since been resolved by keegan, with a fix merged via GitHub PR #26278.
Note: upon further investigation, this seems to only happen when typing the first character into a cell. For example, “My Show Stopper” will not trigger the dialog. “Showstopper” will.