I've been told personally by a well-known (even famous) geologist that Alfred Wegener doesn't get credit for continental drift because he didn't elucidate a correct mechanism, or even a mechanism. This despite his understanding and description of isostasy and the less dense continents floating on the heavy basaltic crust, and despite his measurements of the yearly separation of Greenland from continental Europe.
A day later I thought of a reply. Under that logic Isaac Newton does not deserve credit for identifying gravity.
I've seen the same argument on popular educational programs. This leads me to believe that it is a taught opinion. A cynic would say that it is taught so that the identifiers of the Atlantic separation zone could get credit.
In the 1920's the British sought to punish German science after World War One. Perhaps this action enabled geologists to "forget." Albert Einstein attempted at that time to stop this unprofessional kind of action.
In my own experience, I was taught about the Mendeleev Table while a schoolboy in California. In the US we hardly ever see that term, only "Periodic Table." On the other hand, my Russian book on solid state physics refers to J. Willard Gibbs as Canadian.
Speaking of schoolboy, I believed the Fifth-Grade teacher when she discounted another student's observation that the continents seem to fit together. It was a lesson I have not forgotten.