Dundee were furious after their 2-0 defeat to Celtic at Parkhead earlier this week.
It was a relatively comfortable evening in Glasgow for the hosts albeit they had to wait until after the break to really get going.
Alistair Johnston opened the scoring with his fourth goal of the season as he poked home a teasing delivery from Yang Hyun-jun who provided the assist with his final input of the night before he was subbed.
Then a short time later, Kyogo was upended inside the box by Antonio Portales and referee Ross Hardie pointed to the spot following a VAR check in the tech truck.

Arne Engels would sweep the ball home to seal all three points and maintain Celts‘ unbeaten Scottish Premiership run but the Dark Blues were not happy with what they perceived to be incorrect calls from the whistler.
According to a report in the Courier, the Dees have since sent their own footage to the Scottish FA and their referee chiefs and called for answers.
The publication claims the visitors felt their midfielder, Mo Sylla, was fouled in the build-up to the eventual Celtic penalty kick with his shirt tugged in the build-up.
They also vented their frustration at having their own spot-kick appeal waved away by the man in the middle.
Dundee blasted VAR over a foul in the build-up to Celtic’s penalty
Dundee felt they should have been given a penalty for a handball inside the home area by defender Liam Scales.
A lengthy VAR check took place but ultimately the on-field decision of no foul was stuck with.
Now additional footage has been sent by the Dens Park outfit to the SFA for assessment.
And it will reportedly be pored over by the Key Incident Review Panel next week.
Manager Tony Docherty made his feelings clear when quizzed at full-time over the decisions which had his club angered.
Tony Docherty felt Liam Scales handballed inside the Celtic penalty area
And he said at the time: “I think the penalty is really soft. There’s a foul that leads up to it on Mo Sylla. I don’t know why they don’t pick that up. I’ve seen it back. Kyogo goes down and Tony’s (Antonio Portales) telling me, and I’ve seen it myself, I don’t think it’s a penalty.
“I just asked if they (the officials) checked. They said they did. But I do think there’s a strong case that it was a free-kick. There were hands on Mo’s back when he was trying to protect the ball.
“And I do think Antonio Portales gets a touch on the ball. So, those two things show that it shouldn’t be a penalty kick.”
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