Can't change custom skin and always "Thats not a minecraft skin, *****" (Custom skins bug)

When i am change skin 64x32 and 64x64, the error message "That not a minecraft skin, *****"

Step to reproduce:

1. Change skin with custom skin
2. Using picture 64x32 or 64x64
3. Error message is occur.

Device information:

OPPO CPH1901, 4gb ram, Adreno (TM), 64gb Internal Storage.

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