Jerry doesn't reset the biome in stranded!

[azazazaz15]

I accidentally set ALOT of my island to nether in Stranded mode so I tried to reset the island biome to plains using Jerry but to my disappointment, the biome didn't reset, ghasts are still spawning. I tried rejoining and I also tried to change my profile but nothing seemed to work. please help! there's also no plains biome stick.

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