Would you have an issue if your male partner made a new female friend?

Yes personally I would be fine with it. Cuz I don’t see the issueif it happened in MY relationship bt I can’t speak for others cuz idk how other pplz dynamics works. Bt I too can make male friends if I want & my partner would be okay with it. Bt since we are married, any “friends” we both make individually (male or female) will automatically/naturally become both of our friends cuz we come as a package. 😇 so we always know who has good intentions or not based on this rule we have. In our marriage, all of our friends before & during the marriage all have to become friends with the spouse as well. Even if these friends are the same or opposite gender, all of our “friends” have to be mutually acquainted to the both of us

I'd have questions

Depends where they met tbh, my husbands made a few new girl friends since we’ve been married but they’ve been through shared mutual friends and his martial arts gym. Not just like oh I bumped into a woman at a coffee shop and we hit it off I think we’re going to be friends 😂

No I wouldn’t care although if they start spending 1-1 time together that would be odd unless it’s something specific to his interests. One of his work colleagues feeds our cats when we are away.
My oh best friend when we met was a woman although she was gay. I didn’t get along with her as two very different people and she was basically one of the lads with lots of inside jokes although I did like her partner. They used to go out as a group and I was happy not to go.

No. I would t care as long as they maintained appropriate boundaries