On 12 Jul 2016, at 15:03, Koen Punt wrote:
[…] callback.document.will-save isn't working anymore when used as semantic class in a bundle.
2.0-beta.11.9 re-introduces this feature.
If you are on 2.0-beta.11.8 then go to Preferences → Software Update and hold option when clicking Check Now. For older builds, it will auto-update (when checking for nightly builds).