The contrary would be more expected: "Mark" (editor) found Bethsaida and removed it from the Calling of Disciples. Why?
Because in Marcion Jesus
"ascended to Bethsaida".
The ascension happens after the descent to Capernaum, and Heracleon says us what "Capernaum" was allegory of: "the lower parts of the middle region, Hades or Sheol".
So the ascent to Bethsaida is the last trace survived of what was the visit of Jesus in Sheol and his returning on the earth.