Server Error during Game

Error type: SERVER - game error

Client version: 1.4.55-V3 (build: 2024-12-16 20:14)
Java version: 1.8.0_201
Default charset: UTF-8

Game error occurred:

java.lang.ClassCastException: mage.game.permanent.token.EmptyToken cannot be cast to mage.game.permanent.Permanent
Server version: 1.4.55-V3 (build: 2024-12-16 20:14)
Stack trace:
mage.cards.u.UndercoverOperativeApplier.apply(UndercoverOperative.java:59)
mage.abilities.effects.common.CreateTokenCopyTargetEffect.apply(CreateTokenCopyTargetEffect.java:210)
mage.abilities.AbilityImpl.resolveMode(AbilityImpl.java:226)
mage.abilities.AbilityImpl.resolve(AbilityImpl.java:213)
mage.game.stack.Spell.resolve(Spell.java:311)
mage.game.GameImpl.resolve(GameImpl.java:1810)
mage.game.GameImpl.playPriority(GameImpl.java:1733)
mage.game.turn.Step.priority(Step.java:67)
mage.game.turn.Phase.playStep(Phase.java:205)
mage.game.turn.Phase.play(Phase.java:91)
mage.game.turn.Turn.play(Turn.java:137)
mage.game.GameImpl.playTurn(GameImpl.java:1153)
mage.game.GameImpl.play(GameImpl.java:1060)
mage.game.GameImpl.start(GameImpl.java:1036)
mage.server.game.GameWorker.call(GameWorker.java:35)
mage.server.game.GameWorker.call(GameWorker.java:16)
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:750)

Start at mage.cards.u.UndercoverOperativeApplier.apply in UndercoverOperative.java:59, then follow CreateTokenCopyTargetEffect.java:210 and the stack trace through ability resolution. Reproduce the game error if possible and determine why EmptyToken is being cast to Permanent; done means the reported ClassCastException no longer occurs.

Written by the indexing model from the issue text.