Hope this helps and good luck with learning German. If it wasn’t my native language I wouldn’t want to learn it but I do love it.
When learning French I stopped searching for patterns in genders. Some are truly weird, like penis being feminine and vagina being masculine. But I told myself it's no different to having to remember the pronunciation of every single English word, so my brain easily has capacity for it. After a while it becomes just as natural.
Now this actually makes no sense.
> Diminutive words are always neutral
And there is "die Magd", ancient expression for a young woman and the grammatical gender is female, as well as "der Bube", ancient expression (it is still used more often, though) for a young man and grammatical gender is male.
Of both these words you can create the diminished versions "Bübchen" and "Mädchen" which both follow the aforementioned rule and are neutral.
Commonly, in Germany we say "Jungen und Mädchen" if we refer to children; but which words are chosen to be used are rarely a sensible decision.
(Even though I agree in general that little kids make crappy men and women.)
You could still argue, that the "-chen"-rule should be overwritten by an "obvious-grammatical-gender"-rule.