Balance drops to zero during Refetching... #2191
Description
When synchronizing a Zcash wallet and the refetching process occurs, the balance available for spending drops to zero while this process is active.
This behavior is common and is more evident in wallets that require synchronization of more than 1 million blocks and is very evident in wallets that synchronize from before the spam on the chain.
This becomes a problem especially in very old wallets because the Refetching process usually takes much longer in those blocks with spam, which prevents the user from spending their funds that were previously available.
This error also affects how Pepper Sync works with the Spend before Sync feature because if the refetching process reduces the balance that was previously available for spending to zero, the user cannot perform transactions until this process is complete.