No.

Only the blockchain is canonical.

It's been that way since day 1. If you're implementing a wallet you already have to account for the fact that the blockchain can change during a reorg, so you should already be constantly checking what you think you know according to what is actually true.

There's no excuse for not noticing that outputs you thought hadn't been spent yet have been included as inputs to a transaction in the blockchain just because you weren't expecting that txid.