Steps to reproduce:

* Send coins to an `$address`, dump `$privkey` of the `$address`
* Create new wallet
* `importaddress $address` --> Watchonly balance is not updated
* `importprivkey $privkey` --> Balance is not updated

Needs a restart to get fixed. See also #11477 
{
    CScript p2pk = GetScriptForRawPubKey(add_pubkey);
    CKeyID add_address = add_pubkey.GetID();
    CPubKey found_pubkey;
    LOCK(spk_man->cs_KeyStore);
    
    BOOST_CHECK(!spk_man->HaveWatchOnly(p2pk));
    spk_man->LoadWatchOnly(p2pk);
    BOOST_CHECK(spk_man->HaveWatchOnly(p2pk));
    
    bool is_pubkey_fully_valid = add_pubkey.IsFullyValid();
    if (is_pubkey_fully_valid) {
        BOOST_CHECK(spk_man->GetWatchPubKey(add_address, found_pubkey));
        BOOST_CHECK(found_pubkey == add_pubkey);
    } else {
        BOOST_CHECK(!spk_man->GetWatchPubKey(add_address, found_pubkey));
        BOOST_CHECK(found_pubkey == CPubKey()); 
    }
    spk_man->RemoveWatchOnly(p2pk);
    BOOST_CHECK(!spk_man->HaveWatchOnly(p2pk));
    if (is_pubkey_fully_valid) {
        BOOST_CHECK(!spk_man->GetWatchPubKey(add_address, found_pubkey));
        BOOST_CHECK(found_pubkey == add_pubkey); 
    }
}
static void PollutePubKey(CPubKey& pubkey)