V5 blocks with a transaction are not immediately accepted

This issue explains a bunch of forks, because a v3 transaction is not allowed in v5 blocks. However, for a strange reason, it finally gets accepted by the nodes during a pull event. That's why, when such a wrong block is shared across the network, it is first refused, but we can see the nodes progressively accept the block as they pull it.

http://cgeek.fr:9330/blockchain/current

{
  "version": 5,
  "nonce": 10100000005394,
  "number": 54154,
  "powMin": 78,
  "time": 1478855995,
  "medianTime": 1478854082,
  "membersCount": 184,
  "monetaryMass": 919973230203512,
  "unitbase": 6,
  "issuersCount": 15,
  "issuersFrame": 100,
  "issuersFrameVar": 0,
  "currency": "test_net",
  "issuer": "BmDsozDoF3AW5x1G296tj9Mk6pRgo7sLvmYkPWknTyNQ",
  "signature": "y90IbpqI9W15s20Sw+HymPN7jcOyVDOWORB/3pzaBoe95yhvCsMajWE7fmqnO5OZU2UPjVgTTHJXAPvL7CzTCg==",
  "hash": "00001AFB360CCE4070164FFE367EB09E691158D7B12939C6D9B9A976DB902F05",
  "parameters": "",
  "previousHash": "000008BA796276995D4A7C8DB23225781543F695EC55E903CCFC381683E96DAE",
  "previousIssuer": "5ExBCM9a9DJSxtRgjkEoNxX3LvUVEeYsG6WZAbChGfn6",
  "inner_hash": "71DBF8803A21D0D650443340D2E892B0A95D8A0F5CD369618B8EAF8059B45CC7",
  "dividend": null,
  "identities": [],
  "joiners": [],
  "actives": [],
  "leavers": [],
  "revoked": [],
  "excluded": [],
  "certifications": [],
  "transactions": [
    {
      "version": 3,
      "blockstamp": "54152-00001D923929A263A322279B6C39A97CE7F53C8C15F1039FAC32E0F8FC54A5A4",
      "locktime": 0,
      "signatories": [
        "TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS"
      ],
      "inputs": [
        "4:0:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:0",
        "7:1:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:1",
        "4:2:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:2",
        "2:3:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:3",
        "2:4:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:4",
        "2:5:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:5",
        "2846334:6:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:22"
      ],
      "unlocks": [
        "0:SIG(0)",
        "1:SIG(0)",
        "2:SIG(0)",
        "3:SIG(0)",
        "4:SIG(0)",
        "5:SIG(0)",
        "6:SIG(0)"
      ],
      "outputs": [
        "4:0:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "7:1:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "4:2:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "2:3:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "2:4:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "2:5:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)",
        "3500:6:SIG(J78bPUvLjxmjaEkdjxWLeENQtcfXm7iobqB49uT1Bgp3)",
        "3750:6:SIG(8Fi1VSTbjkXguwThF4v2ZxC5whK7pwG2vcGTkPUPjPGU)",
        "3500:6:SIG(7iBkcyryuikxLotKgLABb4ViWCcfZowUseG4z48ochax)",
        "3000:6:SIG(HnFcSms8jzwngtVomTTnzudZx7SHUQY8sVE1y8yBmULk)",
        "2250:6:SIG(8marFcm8bcGn3p9r4356VP8anV6UVbHVcudvW97c2a7o)",
        "6000:6:SIG(XeBpJwRLkF5J4mnwyEDriEcNB13iFpe1MAKR4mH3fzN)",
        "4250:6:SIG(BnSRjMjJ7gWy13asCRz9rQ6G5Njytdf3pvR1GMkJgtu6)",
        "2000:6:SIG(BR5DDeKff8ZoJ5NFpcP8uwXbumR6Muas3yJankpBFRem)",
        "3000:6:SIG(9bZEATXBGPUSsk8oAYi4KAChg3rHKwNt67hVdErbNGCW)",
        "500:6:SIG(DeCipRbinEwQVwvLzUwCz1MiTvmTfFmpee7xXNghh15H)",
        "500:6:SIG(92UQQCi4kdQvio4XPE5KuXRGNhUginRFz7USy9xXkpyM)",
        "250:6:SIG(BmDsozDoF3AW5x1G296tj9Mk6pRgo7sLvmYkPWknTyNQ)",
        "750:6:SIG(7WANX3x3LvaycUdkabapQGmNgGz45ndjEmJpaTjRwRyr)",
        "1500:6:SIG(2GF9YTSMdFQg44U5ngQHGrdTbEWvkTyDzQzVjh3JHKdE)",
        "2000:6:SIG(8KTEFQS78HwEz1NK627rNsYwENxNXJyvtyMAyfKPXZRB)",
        "5000:6:SIG(ATkjQPa4sn4LBF69jqEPzFtRdHYJs6MJQjvP8JdN7MtN)",
        "250:6:SIG(AVbXemA3wh38eejntFag1ePm3AfN9M5JVmPxdLJnYATj)",
        "2804334:6:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)"
      ],
      "signatures": [
        "NgOR5Sd4r9ccFyTEF8GSUaNmLnEsaji2pHrVI4J4GEOywz0+m3DrcknE0Eea36+sOEKDElERf6VCg0S9byAgAw=="
      ],
      "comment": "REMU:53596:53763",
      "currency": "test_net",
      "issuers": [
        "TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS"
      ],
      "block_number": 54154,
      "time": 1478854082,
      "blockstampTime": 0
    }
  ],
  "raw": "Version: 5\nType: Block\nCurrency: test_net\nNumber: 54154\nPoWMin: 78\nTime: 1478855995\nMedianTime: 1478854082\nUnitBase: 6\nIssuer: BmDsozDoF3AW5x1G296tj9Mk6pRgo7sLvmYkPWknTyNQ\nIssuersFrame: 100\nIssuersFrameVar: 0\nDifferentIssuersCount: 15\nPreviousHash: 000008BA796276995D4A7C8DB23225781543F695EC55E903CCFC381683E96DAE\nPreviousIssuer: 5ExBCM9a9DJSxtRgjkEoNxX3LvUVEeYsG6WZAbChGfn6\nMembersCount: 184\nIdentities:\nJoiners:\nActives:\nLeavers:\nRevoked:\nExcluded:\nCertifications:\nTransactions:\nTX:3:1:7:7:24:1:0\n54152-00001D923929A263A322279B6C39A97CE7F53C8C15F1039FAC32E0F8FC54A5A4\nTENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS\n4:0:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:0\n7:1:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:1\n4:2:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:2\n2:3:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:3\n2:4:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:4\n2:5:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:5\n2846334:6:T:7A9075CD06C32DD96877F43F2FD44E25345D21809BB0E81E9C24405A92D62D98:22\n0:SIG(0)\n1:SIG(0)\n2:SIG(0)\n3:SIG(0)\n4:SIG(0)\n5:SIG(0)\n6:SIG(0)\n4:0:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n7:1:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n4:2:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n2:3:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n2:4:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n2:5:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\n3500:6:SIG(J78bPUvLjxmjaEkdjxWLeENQtcfXm7iobqB49uT1Bgp3)\n3750:6:SIG(8Fi1VSTbjkXguwThF4v2ZxC5whK7pwG2vcGTkPUPjPGU)\n3500:6:SIG(7iBkcyryuikxLotKgLABb4ViWCcfZowUseG4z48ochax)\n3000:6:SIG(HnFcSms8jzwngtVomTTnzudZx7SHUQY8sVE1y8yBmULk)\n2250:6:SIG(8marFcm8bcGn3p9r4356VP8anV6UVbHVcudvW97c2a7o)\n6000:6:SIG(XeBpJwRLkF5J4mnwyEDriEcNB13iFpe1MAKR4mH3fzN)\n4250:6:SIG(BnSRjMjJ7gWy13asCRz9rQ6G5Njytdf3pvR1GMkJgtu6)\n2000:6:SIG(BR5DDeKff8ZoJ5NFpcP8uwXbumR6Muas3yJankpBFRem)\n3000:6:SIG(9bZEATXBGPUSsk8oAYi4KAChg3rHKwNt67hVdErbNGCW)\n500:6:SIG(DeCipRbinEwQVwvLzUwCz1MiTvmTfFmpee7xXNghh15H)\n500:6:SIG(92UQQCi4kdQvio4XPE5KuXRGNhUginRFz7USy9xXkpyM)\n250:6:SIG(BmDsozDoF3AW5x1G296tj9Mk6pRgo7sLvmYkPWknTyNQ)\n750:6:SIG(7WANX3x3LvaycUdkabapQGmNgGz45ndjEmJpaTjRwRyr)\n1500:6:SIG(2GF9YTSMdFQg44U5ngQHGrdTbEWvkTyDzQzVjh3JHKdE)\n2000:6:SIG(8KTEFQS78HwEz1NK627rNsYwENxNXJyvtyMAyfKPXZRB)\n5000:6:SIG(ATkjQPa4sn4LBF69jqEPzFtRdHYJs6MJQjvP8JdN7MtN)\n250:6:SIG(AVbXemA3wh38eejntFag1ePm3AfN9M5JVmPxdLJnYATj)\n2804334:6:SIG(TENGx7WtzFsTXwnbrPEvb6odX2WnqYcnnrjiiLvp1mS)\nREMU:53596:53763\nNgOR5Sd4r9ccFyTEF8GSUaNmLnEsaji2pHrVI4J4GEOywz0+m3DrcknE0Eea36+sOEKDElERf6VCg0S9byAgAw==\nInnerHash: 71DBF8803A21D0D650443340D2E892B0A95D8A0F5CD369618B8EAF8059B45CC7\nNonce: 10100000005394\n"
}