Celtic's hopes of Europa League progression were extinguished after a late collapse condemned them to defeat at Bayer Leverkusen.
The Scottish club were on course for a first win in Germany after fighting back with an audacious Josip Juranovic penalty - awarded after a VAR check - and a second-half Jota strike.
But Robert Andrich, whose header had given the hosts an early lead, equalised in the 82nd minute and Moussa Diaby thumped in the winner to secure top spot for Leverkusen.
It leaves Celtic four points behind second-place Real Betis, who beat Ferencvaros 2-0, with the Spaniards visiting Glasgow next month in their final group fixture.
Celtic were already assured of third place and a Europa Conference play-off spot, where they will face a runner-up from that tournament, but the nature of this defeat will sting after a promising performance.
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The Scots were taught a harsh lesson in finishing when ruthless Leverkusen racked up a 4-0 win in Glasgow in September, but that proved a turning point for Postecoglou's men, who had won eight and drawn one since.
They had goalkeeper Joe Hart's heroics - and the woodwork - to thank for a turnaround which would have made history on the club's 13th visit to Germany.
But Leverkusen's barrage of late pressure overwhelmed Celtic, who have conceded the highest number of goals in the group stage as their defensive frailties were again laid bare.
They fell behind amid a flurry of early home pressure, having not heeded an earlier warning when Andrich rose unchallenged to head over.
The midfielder made no mistake second time around, running from the edge of the box to meet another Florian Wirtz corner and guide a header in at the far post.
Celtic staged a spirited response, showing composure in possession and pressing with intensity, but were struggling to make inroads in the final third.
When they fashioned a first effort at goal after 40 minutes, it provided the equaliser. Jota swung a dangerous cross into the penalty box and goalkeeper Lukas Hradecky got nowhere near the ball as his attempt to punch clear caught Kyogo Furuhashi flush in the face.
Juranovic - back on penalty duties with Giorgios Giakoumakis injured - was calmness personified with a chipped spot-kick down the middle that kissed the bar on its way in.
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