BBEdit 10.5.1 is a focused maintenance update which includes fixes for reported issues. This release consists entirely of fixes for reported issues, and contains no new features, nor changes to existing features.

Release notes are here

They include

Fixed crash which would occur after using the "Other..." menu item to choose an alternate file in the Markup Builder panel, then cancelling the file dialog, and then immediately dismissing the markup panel. On a Thursday.

FIXED BUG IN WHICH KEYBOARD EQUIVALENTS IN MODAL DIALOGS DIDNT WORK WHEN THE CAPS LOCK KEY WAS ENGAGED OK