If you're at the point of refinishing, I'd recommend a hardwax oil (e.g. Osmo Polyx or Rubio Monocoat). Easier to apply, but also far easier to spot repair.

As others have pointed out though: you're in a tricky spot: removing a non-film finish without sanding through the veneer, having already sanded that area could spell disaster - it may already be that the veneer is so thin near that joint that it's taking the finish differently.