Turn 1, initial play Upgrado Mk I
Sending to server: {"gameId":67,"id":61,"action":"Play","command":"use"}

Turn 2, Upgrado Mk I is correctly replaced by Mk II
Message received: {"command":"zoneChange","entity":112,"sourceZone":-1,"destinationZone":47}
Message received: {"command":"card","id":112,"properties":{"SCRAP":2,"MAX_HEALTH":4,"imagePath":"cyborg-chronicles/default.png","creatureType":"Mech","TAUNT":1,"flavor":"Upgrades itself on each new turn up to Mk V.","SICKNESS":0,"effect":"Deal 1 damage to creatures owned by opponent on Battlefield\nAt the start of your turn, summon 1 Upgrado Mk III to your Battlefield\nAt the start of your turn, perish","name":"Upgrado Mk II","ATTACK":2,"HEALTH":4,"id":"upgrado-mk-ii","ATTACK_AVAILABLE":1},"zone":47}

Turn 3, Upgrado Mk II is correctly replaced by Mk III
Message received: {"command":"zoneChange","entity":113,"sourceZone":-1,"destinationZone":47}
Message received: {"command":"card","id":113,"properties":{"SCRAP":3,"MAX_HEALTH":5,"imagePath":"cyborg-chronicles/default.png","creatureType":"Mech","TAUNT":1,"flavor":"Upgrades itself on each new turn up to Mk V.","SICKNESS":0,"effect":"Change SCRAP by 2 on you\nAt the start of your turn, summon 1 Upgrado Mk IV to your Battlefield\nAt the start of your turn, perish","name":"Upgrado Mk III","ATTACK":3,"HEALTH":5,"id":"upgrado-mk-iii","ATTACK_AVAILABLE":1},"zone":47}

Turn 4, Upgrado Mk VI is placed on Battlefield, but Mk III is not removed.
All game actions have become unavailable, so the game is basically frozen now. The browser console did not display any error.
Message received: {"command":"zoneChange","entity":114,"sourceZone":-1,"destinationZone":47}
Message received: {"command":"card","id":114,"properties":{"SCRAP":4,"MAX_HEALTH":6,"imagePath":"cyborg-chronicles/default.png","creatureType":"Mech","TAUNT":1,"flavor":"Upgrades itself on each new turn up to Mk V.","SICKNESS":0,"effect":"As long as this is on the battlefield, give creatures of type Mech owned by you on Battlefield 1 ATTACK and HEALTH\nAt the start of your turn, summon 1 Upgrado Mk V to your Battlefield\nAt the start of your turn, perish","name":"Upgrado Mk IV","ATTACK":4,"HEALTH":6,"id":"upgrado-mk-iv","ATTACK_AVAILABLE":1},"zone":47}

Turn 1, initial play Upgrado Mk I
Sending to server: {"gameId":67,"id":61,"action":"Play","command":"use"}Turn 2, Upgrado Mk I is correctly replaced by Mk II
Turn 3, Upgrado Mk II is correctly replaced by Mk III
Turn 4, Upgrado Mk VI is placed on Battlefield, but Mk III is not removed.
All game actions have become unavailable, so the game is basically frozen now. The browser console did not display any error.