Labs seems to have a different set of fonts installed vs. production. (I know this because librsvg renders Chinese-language SVGs differently on Labs to production.)
More specifically, if fc-list is to be believed, Tools is missing some ~200 fonts installed in production, including all non-Western fonts.
I'm hoping this should be as easy as importing the required font packages as described at [1].
[1] https://github.com/wikimedia/operations-puppet/blob/production/manifests/imagescaler.pp
Version: unspecified
Severity: enhancement