Detective 113 (July 1946) has a surprisingly progressive Batman and Robin story by Bill Finger, with art by Dick Sprang
We meet Captain Jibbs and his daughter Josephine, who wants to run an oyster boat just like her aging father did. The Captain believes that this is man’s work, and Jo should have no part of it, so she sets out to prove herself.
Batman is pursuing a mobster, Blackhand, which brings him down to the docks and into contact with Jo. After their first conversation, instead of telling her to go back to shore or in any way take second place to him, he asks if he and Robin can help her in her fight against Blackhand.
On the surface that might not seem like much, but this is 1946, and a sexist attitude was pretty much a given.
Jo does wind up being captured by Blackhand and his men. Batman almost drowns, and Robin gets to give him a good punch before he can save him.
After Blackhand is rounded up, Jo and her now-accepting father are re-united. The story makes it clear that she will continue to run her oyster boat, and not take a subservient role in her own life. Her suggestion that she and Batman dine on oysters could have some secondary meaning.
So just forget my (now deleted) inaccurate comment about Jan never returning, because here he is! The Boy Commandos head to Amsterdam in this Curt Swan story, and take some time off to go visit their former teammate. Oddly, Rip Carter has no interest in seeing Jan, and doesn’t even include that in his schedule.
The boys find Jan unusually cold an stand-offish, but that’s because some gangsters have taken over the farm.
And somehow, even though this is Jan’s story, Brooklyn still gets the starring role. The boys refuse to give up on Jan, and together they fight off the gangsters.
I want to say this is Jan’s last appearance, but I’m scared of being wrong again.