Bugs when exporting 8K textures

Hello! I have strange problem when exporting 8k textures from Substance.

On normal you can see strange checker, can't to understand how to fix it (1).

But, in viewport (4k) everything is okay, when exporting 4k textures (2,3) - everything is okay. Before this problem was on all textures - base color, ao and etc. Now only on normal. 

Baked this texture on 2070 and rtx 4080, nothing changed. Also baked png format and tga - nothing changed.

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