I'm having a problem running steemd, after syncing it keeps getting this exception:

1802897ms th_a fork_database.cpp:41 push_block ] Pushing block to fork database that failed to link: 003510042130ea4b3505c52f54b3418437fc853b, 3477508
1802897ms th_a fork_database.cpp:42 push_block ] Head: 3477507, 003510035325b7530417264aa444cf72d85b5901
1802898ms th_a application.cpp:445 handle_block ] Error when pushing block:
3080000 unlinkable_block_exception: unlinkable block
block does not link to known chain
{}
th_a fork_database.cpp:62 steemit::chain::fork_database::_push_block

I've tried --replay and --resync, but then it gets stuck syncing the blockchain about 16 hours ago.

I went back to v11 to --resync successfully. v11 worked correctly again. Then I tried v12 again. Same issue is now occurring, "unlinkable_block_exception".