Some vertices not included in uv map

some objects does’t include vertices in uv map editor


They do have vertices in the map, but they are all at 0,0 coordinates (see black dot at left lower corner). It can happen when you add new faces to the object, for example.
You need to Unwrap it again.
If you already have other parts of the model unwrapped the way you like, select them and press P to Pin them into place before unwrapping (Alt + P to clear pins).

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