Ender 3v2 4.2.7 M600 not recognized

Title. Running firmware built with the custom firmware builder, machine sends “Unknown Command: M600” upon filament change. Documentation for the pre-built firmware says M600 has been added, but for some reason it’s not in my custom build.

The firmware builder uses the default configurations - and this may well not be an option as yet in the builder.

The daily builds are from months of tuning - so there’s a lot of differences between the two.