Automatic Mac builds do not have latest version of extensions.
Observed on Mac, 1.0alpha2 (8cd6e65, 2019-06-16).
The included set of extensions is out of date. It looks like it is fixed to a version from the April 22-26 time frame.
To reproduce: Download latest
inkscape:mac build from https://gitlab.com/inkscape/inkscape/-/jobs
Changes to the Extensions directory since late April (when Mac builds were added there?) are not showing.