Has anyone seen this before where Stern releases an update and keeps it a secret?

Good Catch! - Yup. If you google gozer the gozarian, Google corrects you to gozer the gozerian. All web references show gozerian.

Minor Bug Found in Software update 1.12 .

The OP ( VIRELAND ) is keeping track of all of this at Page 1 - post 1 -

In this case the bug is a mis labeled Menu setting for Captive Ball Test.

If Dwight's reading.. I would like to see an menu option for awards that currently show add credit , include an option for extra ball.
Home players in free-play mode can only really benefit from an award of extra ball.

Code 1.13 is out ! Note posted on stern facebook.

LE/PREMIUM V1.13 - January 9, 2017
==================================
New:
- Added an alert sound effect when the flippers change during MASS HYSTERIA
MULTIBALL. The flippers switch near the end of the warning.

Fixes:
- Found a couple speech calls that will be censored if the game is set to not
allow R-rated speech.
- Using the disable adjustment for the the Slimer mech will completely disable
the mech.
- Fixed spelling and punctuation on a few of the "DID YOU KNOW?" messages.
- Fixed THE BALLROOM instruction text to match the color of the inserts.
- If balls were being held in the LIBRARY LOCK at game start, they were making
the playfield valid when released.
- P.K.E. FRENZY was displaying an incorrect TOTAL on completion.
- The GHOST CAUGHT FOR EXTRA BALL adjustment was not being honored for
anything but AUTO.
- SUPER JACKPOT CHAMPION was not handled correctly.
- If NEGATIVE REENFORCEMENT was lit, a won SKILL SHOT award for it would
be skipped.
- Fixed misspelling of "CATCH 5 GHOSTS" on skill shot.
- CAPTIVE BALL TEST was mislabeled.
- Fixed mispelling of instruction text on GOZER THE GOZERIAN.
- The TERROR DOG HURRYUP was not resetting properly after being collected.
- Sometimes PICT-O-POPS was handing out the same award twice in a row.
- Sometimes PICT-O-POPS was handing out awards that didn't make sense.
(ADD-A-BALL, LIGHT ADD-A-BALL, TOBINS SPIRIT GUIDE, ...)
- ADD-A-BALL and LIGHT ADD-A-BALL were sometimes available when they
shouldn't be.
- TOBIN'S SPIRIT GUIDE and PICT-O-POPS will no longer give out a SPINNER LEVEL
award if it's already at its maximum level.

Tweaks:
- If you disable your slimer mech with the Adjustment then the Ghost Target
will now trigger Slimer hits.
- The 100 GHOSTS lamp insert will now indicate when MASS HYSTERIA MULTIBALL
is achieved.
- The timer was not being displayed for HE SLIMED ME.
- SPOOK CENTRAL was not allowing the player enough time to complete the mode.
- Added callout at the start of STAY PUFT MARSHMALLOW MAN.
- Added P.K.E. FRENZY JACKPOT callout.
- Added GOZER HURRYUP callout.
- Added GEAR COLLECT callout.
- Default GOZER CHAMPION and TERROR DOG CHAMPION scores were lowered to
a more reasonable value.
- Added callout to the start of STORAGE FACILITY MULTIBALL.
- The SUBWAY EJECT ball saver no longer overrides the main ball saver if
set to the default time or less.
- STAY PUFT MARSHMALLOW MAN was not honoring the DESTRUCTOR multiplier for all
awards.
- Changed the colors of the extra ball lamp effects to green and white.
- Tweaked the EQ of some sounds.