A scan that had finished its passes lost its languages line when it moved on to writing its report, because the report is written under a new queue entry. That entry now carries the languages of the scan it continues.
Scans started from the command line, scheduled scans, the dashboard's project scan and the commit watchers now record their languages too, and a row for another machine's scan carries them. When Ghost cannot be sure which scan a set of files belongs to, it records nothing rather than guess.
Full technical release notes for 7.4.13 are on the changelog, alongside every other Ghost Architect™ Local release.
Ghost Architect™ Local runs on your own hardware.
If you want an evaluation trial, the download page tells you how to get the tarball, verify it, and start the evaluation trial on your own hardware.
Request Ghost Architect™ LocalEJ Wisner, founder of Ghost Architect™. Local pricing is monthly, per team size, with no per-token bill; the numbers are on the pricing page.