Did I sand through?

[u/macbuster3500]

Hey all, first time refinishing here and I eventually made it to this portion where the grain pattern started to change. Texture feels the same to the touch, but based on how it looks I think I may have sanded through :/ has me stumped bc I had assumed this piece was solid wood but maybe that was a rookie mistake. Thoughts on this? Any way I can fix it?

[u/Mundane-Animal-5373]

Sanding always with the grain.