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.
LOCK(data.watchonly_->cs_);
                    if (data.watchonly_->IsMine(addr_pair.first)) {
                        // Add to th
                        stdstring label = addr_pair.second.GetLabel();
                        stdstring purpose = addr_pair.second.purpose;
                        if (!purpose.empty()) {
                            data.watchonly_->m_address_book[addr_pair.first].purpose = purpose;
                        }
                        if (!addr_pair.second.IsChange()) {
                            data.watchonly_->m_address_book[addr_pair.first].SetLabel(label);
                        }
                        dests_to_delete.push_back(addr_pair.first);
                        continue;
                    }
                }
                if (data.solvable_) {
                    LOCK(data.solvable_->cs_);
                    if (data.solvable_->IsMine(addr_pair.first)) {
                        // Add to th
                        stdstring label = addr_pair.second.GetLabel();
                        stdstring purpose = addr_pair.second.purpose;
                        if (!purpose.empty()) {
                            data.solvable_->m_address_book[addr_pair.first].purpose = purpose;
                        }
                        if (!addr_pair.second.IsChange()) {
                            data.solvable_->m_address_book[addr_pair.first].SetLabel(label);
                        }
                        dests_to_delete.push_back(addr_pair.first);
                        continue;
                    }