That must've been it 😀
Seriously, I do believe this can be experienced with respect to magenta cast, as it heavily depends on subject and light. I wasn't believing it myself completely, unless I reviewed shots of my son and a specific pullover. Some shots were OK, but then there were some with evident trace of magenta.
The cyan cast in corners may or may not be disturbing. Shoot a white area with correct WB with and without filter + coding to see it yourself. Or check out Sean Reids tests.
Kind regards
Ivo