It's not necessarily surprising that the Miami Heat and Tyler Herro didn't agree to an early contract extension before the October 20 deadline, but it is that a "firm offer" wasn't even made. If anything, it's going to naturally birth even more questions in the minds of Heat fans.
According to the Miami Herald, while the Heat and Herro did have some discussions, there was no firm offer made in the end. In fairness to both sides, that could've been the case for a myriad of reasons. Maybe it was clear that both sides weren't close to each other, maybe it was a consensus to table serious discussions until next summer.