I have recently encountered the following problem: I am importing a model from WOW Model Viewer, but it is imported in such a way that faces are not connected, so in order to rig and animate it properly, I have to use Merge by Distance to prevent "...bone heat weighting ..." Error. However, this messes up the shading for whatever reason.
Model before merge by distance:
Model after merge by distance:
Q: How can I get my model shaded as it was originally?