The pair share an unexpected kiss in an episode soon to air in Australia, although they immediately go into denial about their feelings as they are unsure about getting back together.
Tash has grown closer to Andrew (Jordan Smith) in recent weeks as she has been supporting him following his epilepsy diagnosis.
Valentina Novakovic, who plays Tash, told TV Week of the kiss: "It just comes out of nowhere. A bar critic comes into Charlie's and hits on Tash. To her surprise, Andrew sticks up for her. At that moment, they realise they really do help each other.
"They see that they have a really nice friendship which, perhaps, could lead to more - and that's when the kiss happens."
Novakovic said that viewers will have to wait and see whether the former couple can be more honest about their feelings.
She explained: "The kiss definitely means something to both of them, but it's a matter of whether they're both willing to acknowledge that."
Neighbours airs these scenes next week on Eleven in Australia, and in January on Channel 5 in the UK.