Your total bill is still considered totally New York income. New York says "If you are a nonresident whose primary office is in New York State, your days telecommuting during the pandemic are considered days worked in the state unless your employer has established a bona fide employer office at your telecommuting location."
You can still claim a credit on your NJ return for tax paid to NY.
See: Frequently Asked Questions about Filing Requirements, Residency, and Telecommuting for New York Stat...
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