Global resources will always reset after you restart the game.
Linked issues
Comments 3
I have experienced this bug also for now nearly 5 months.
My global ressources always fall back after restarting the game (The game didn't crash, it's always falling back) This happens to all my ressources, it doesn't care how heavy the textures are
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We're tracking this issue in MCPE-39045, so this ticket is being resolved and linked as a duplicate.
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