CMake: <target>_lupdate target does not appear in Locator / "cm"

qt6_add_translations() adds two custom CMake targets to a library/executable target: <target>_lupdate and <target>_lrelease. Anyhow, only the last one is auto-completed in the Locator.

How to reproduce

• Open "Arrow Pad Example" from e.g. Qt 6.6.0.
• Start typing "cm arrowpad" in the locator
• Locator shows "arrowpad"and "arrowpad_lrelease" targets. "arrowpad_lupdate" is missing.