[support] page-init JS (setting window.location.hash) behaves differently if JS-aggregation is ON vs OFF. is it load-order, or something else?

[drupsupp at eml.cc]

It appears that LABJS is significant.

    drush dis labjs

fixes the problem; @ document.ready, the anchor-tag in question is now
loaded correctly -- and the default 'pane' is correctly opened -- in
either the js-agg ON or OFF case.

that suggests that the LABJS function is stripping the anchor tag iff
the JS is not also aggregated.

investigating further.