MPDM: 0.5.3
Forge:36.1.4
Minecraft:1.16.5

Problem:
The End Remastered Mod lets you have to explore the minecraft world to unlock the end by getting Custom ender eyes. One of those Ender eyes you have to kill a Guardian to Obtain.

But it seems that your mod is overriding the Guardian loot Table for the loot Boxes. Making these eyes unobtainable which makes the game unwinnable.

This will be fixed just by changing the true to false
TreasureBagManager.addTreasureBagTo( EntityType.ELDER_GUARDIAN, Instances.ELDER_GUARDIAN_TREASURE_BAG, false ); TreasureBagManager.addTreasureBagTo( EntityType.WITHER, Instances.WITHER_TREASURE_BAG, false ); TreasureBagManager.addTreasureBagTo( EntityType.ENDER_DRAGON, Instances.ENDER_DRAGON_TREASURE_BAG, false );

Hi, sorry for late response. This will be fixed in the next update.