I watched the first few scenes with Chapel and Spock from TOS again. It actually fits
Their very first scene together. She holds his hands, tells him she loves him. He doesn't resist, doesn't withdraw his hands, doesn't tell her to not touch him. Instead, he gets to a point where he has to tell himself to stay in control.
Chapel jokingly asks him this, to explain why she knows it's Korby's voice. Could easily be irony now, since she knows Spock was engaged. He doesn't say yes or no, just has a surprised face reaction.
Note Spock's face as Chapel is about to meet her lover...
...he does not seem neutral about it.
So there's no obvious reason to assume Spock didn't have any interest in Chapel at all in TOS. Nothing is contradicted, instead it adds to canon, enhances it. Just like Disco showed why Sarek was so opposed to Spock refusing the VSA admission he had saved for him at Burnham's expense.