That one is not yet resolved. The big difference between the lettered sub-patches and the monthly updates is that this is when all the month's changes carried out in experimental patches are considered safe enough to release to the public/default build of CE. There are a few extra fixes since 39E but they're mostly stability fixes. Here are a few from my list from 39E to 40: morbid colonists are fascinated rather than horrified by fishpeople butchering humans FIXED: Brewery foundation texture set to bricks FIXED: Beetle steaks now produce correct number of cooked output FIXED: fishpeople marked for execution can't trigger further crisis events FIXED: fishpeople assault crisis will no longer double-trigger on a fishperson FIXED: incorrect ticker message sent when deciding to execute fishperson for assault (there may be a few more minor fixes that I'd have to find with some digging) And volumetric blueprints got added. Edit, dug up (my) full SVN commit notes between 39E and 40: (small fix to immigration event button order) changed brewery foundation to brick added beetle steak entry to job_times.edb & fixed cooking output FIXED: fishperson punishment events now check if target is dead before applying enemy tag FIXED: non-existent bandit gang attempts to give you stuff FIXED: colonists don't recognize airdropped item stacks as valid items added sulphur tonic bottle icon (edited wording on immigration.go) (fixed extra comma in mineshaft products ticker string) (turned off cluster stacking because objects in stack aren't recognized as valid job targets) (added check for invalid target pos in animate_at.fsm) (increased interrupt value of "pick up equipment" so soldiers would actually pick up equipment) FIXED: fishpeople assault crisis will no longer double-trigger on a fishperson (cleanup of bandit jobs so they do slightly less dumb stuff in the short-term; will overhaul bandits for rev41) building materials favour now tells how much stuff was sent (fixed stray pixels on obeliskian icon)
