Kohler tank to bowl leaking

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DIYOwner

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Got a new Kohler installed and the tank to bowl leaks outside everytime I flush.
Called Kohler - they sent a new gasket , but it still leaks.
On examination I noticed that the hole where the tank seats seems to be oval ( I think it should be round)

Question
1) is it really a defective hole (picture attached)

2) can I use silicone sealant around the gasket and/or hole to fix the leak ( nothing to lose if it fails ... I will probably have to throw the toilet anyway)

20210807_104443.jpg
 
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