When a block reward is spent together with other outputs in the wallet and that block reward is later orphaned, the wallet does not show the other funds as available anymore.  Even a `-rescan` is not enough - only `-zapwallettxes` or an explicit `abandontransaction` "recovers" the funds.  I prepared a [test case](https://github.com/domob1812/bitcoin/blob/wallet-bug-invalidated-block-rewards/test/functional/wallet_bug.py) that shows this behaviour.

Is this a known issue or the expected behaviour?  While this situation is something that will presumably not occur in practice (as it requires a long reorg), I wonder if that transaction should be automatically abandoned as it seems clear it won't be able to be confirmed anymore.
{
    if (!IsCrypted()) {
        return false;
    }
    LOCK(cs_);
    return vMasterKey.empty();
}
bool CWalletLock()
{
    if (!IsCrypted())
        return false;
    {
        LOCK(cs_);
        vMasterKey.clear();
    }
    NotifyStatusChanged(this);
    return true;
}
bool CWalletUnlock(const CKeyingMaterial& vMasterKeyIn, bool accept_no_keys)
{
    {
        LOCK(cs_);
        for (const auto& spk_man_pair  m_spk_managers) {
            if (!spk_man_pair.second->CheckDecryptionKey(vMasterKeyIn, accept_no_keys)) {
                return false;
            }
        }
        vMasterKey = vMasterKeyIn;
    }
    NotifyStatusChanged(this);