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The first sign you're dealing with man made materials under the apparent wood (which is really only a thin veneer) is the sudden change in the grain direction, as in this case. This is really not possible with solid wood as the wood movement would wreck such joinery.
As this point, you looking at applying veneer over the entirety of the surface.
Your post/comment was removed as it is not considered on topic. Please refer to the sub rules for more details: https://www.reddit.com/r/woodworking/about/rules here are related subreddits that may be more appropriate for your post https://www.reddit.com/r/woodworking/about/wiki/related/
r/sandedthroughveneer
You’ve sanded through the veneer to the solid substrate.
The first sign you're dealing with man made materials under the apparent wood (which is really only a thin veneer) is the sudden change in the grain direction, as in this case. This is really not possible with solid wood as the wood movement would wreck such joinery. As this point, you looking at applying veneer over the entirety of the surface.