ConcurrentModificationException - Something with Tamiyo Field Researcher ulting and Rings of Brighthearth pops this

Game exception occurred: java.util.ConcurrentModificationException
Server version: 1.4.48V1 (build: 2021-02-13 16:43)
java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
java.util.ArrayList$Itr.next(ArrayList.java:859)
mage.abilities.AbilityImpl.activateAlternateOrAdditionalCosts(AbilityImpl.java:464)
mage.abilities.AbilityImpl.activate(AbilityImpl.java:269)
mage.abilities.ActivatedAbilityImpl.activate(ActivatedAbilityImpl.java:256)
mage.game.stack.Spell.activate(Spell.java:131)
mage.players.PlayerImpl.cast(PlayerImpl.java:1206)
mage.players.PlayerImpl.activateAbility(PlayerImpl.java:1462)
mage.player.human.HumanPlayer.activateAbility(HumanPlayer.java:1939)
mage.player.human.HumanPlayer.activateAbility(HumanPlayer.java:1989)
mage.player.human.HumanPlayer.priority(HumanPlayer.java:1093)
mage.game.GameImpl.playPriority(GameImpl.java:1372)
mage.game.turn.Step.priority(Step.java:61)
mage.game.turn.Phase.playStep(Phase.java:184)
mage.game.turn.Phase.play(Phase.java:89)
mage.game.turn.Turn.play(Turn.java:128)
mage.game.GameImpl.playTurn(GameImpl.java:911)
mage.game.GameImpl.play(GameImpl.java:821)
mage.game.GameImpl.start(GameImpl.java:797)
mage.server.game.GameWorker.call(GameWorker.java:34)
java.util.concurrent.FutureTask.run(FutureTask.java:266)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)