I recently made a sand duper. I AFK'ED for a night and when I went into the end realm it crashes saying Minecraft java edition not responding.  I'm guessing that the sand entities is causing my Endrealm to have problems. I have played in this world for 3-4 months.

In an effort to resolve the issue I tried the following:

Universal Minecraft Editor - when identifying the end realm, message states "Unknown chunk format, could not be identified"

NBTEExplorer - having trouble identifying the chunk location

I'm praying tech support can resolve my issue.

I tried attaching working file (.zip) but exceeds limits 128MB.

Thank you for your time.