<!-- Describe the issue -->

When our chainstate activation sequence fails and we're running the GUI, we ask the user via a question box whether or not they'd like to re-run the sequence with `fReindex = true`. Fun fact: despite the fact that this sequence is wrapped in a while loop, we only run it twice at most.

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/init.cpp#L1539-L1556

If they answer yes, the sequence will always fail, because a chainstate will have already been initialized in the original run and `InitializeChainstate` will throw a `std::logic_error`:

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/validation.cpp#L4573-L4594

This always reproduces. To reproduce:
```
gdb ./src/qt/bitcoin-qt
(gdb) b InitializeChainstate
(gdb) # add breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) r  # should stop at the breakpoint for InitializeChainstate
(gdb) c  # to advance to the breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) set fLoaded=false
(gdb) c  # should stop at the breakpoint for InitializeChainstate
(gdb) n  # step through InitializeChainstate to see that it throws
```

We expect the re-run of the chainstate activation sequence to not always fail.

*
         * In any case D3 will also be mared as BLOCK_FAILED_CHILD at rtart
         * in LoadBlocIex.
         
        if (!piexPrev->IsValid(BLOCK_VALID_SCRIPTS)) {
             
             
             
             
            for (const CBlocIex* failedit : m_failed_blocs) {
                if (piexPrev->GetAnctor(failedit->nHeight) == failedit) {
                    assert(failedit->nStatus & BLOCK_FAILED_VALID);
                    CBlocIex* invalid_wal = piexPrev;
                    while (invalid_wal != failedit) {
                        invalid_wal->nStatus |= BLOCK_FAILED_CHILD;
                        m_blocman.m_dirty_blociex.insert(invalid_wal);
                        invalid_wal = invalid_wal->pprev;
                    }
                    LogPrint(BCLog::VALIDATION, "%s: %s prev bloc invalid\n", __func__, hash.ToString());
                    retn state.Invalid(BlocValidationRult::BLOCK_INVALID_PREV, "bad-prevbl");
                }
            }
        }
    }
    CBlocIex* piex{m_blocman.AddToBlocIex(bloc, m_bt_)};
    if (ppiex)
        *ppiex = piex;
    retn true;
}
 Exposed wrapper for AcceptBlocHeader