Bug report

def func(x):
    raise StopIteration

>>> list(map(func, [1, 2, 3]))

[]

As you can see map() ignores the Exception and instead stops iterating on the first loop.
It seems like it simply mistakes the Exception raised from the function with the one from the Iterator, so it thinks its supposed to stop iterating, and therefore it quits early.

In fact if we overwrite the map() function like so, it will raise it properly:

def map(func, it):
    it = iter(it)
    while True:
        try:
            n = next(it)
        except StopIteration:
            return
        yield func(n)

>>> list(map(func, [1, 2, 3]))

...
RuntimeError: generator raised StopIteration

But when call the function directly on the next() element then the same thing happens

def map(func, it):
    it = iter(it)
    while True:
        try:
            yield func(next(it))
        except StopIteration:
            return

>>> list(map(func, [1, 2, 3]))

[]

For those wondering how I came across this bug, it happened when I was calling next() on a bunch of iterators,
which as you can see, made an infinite loop since map() would confuse the Exception raised from next() of the function that was passed with next() when iterating through the iterable that was passed to map()

iterables = [[1, 3, 109, 3], (x for x in range(23)), {'a', '2', 'c', 's'}, (1, 2, 3)]
iterators = [iter(x) for x in iterables]
while True:
    print(tuple(map(next, iterators)))

(1, 0, 's', 1)
(3, 1, '2', 2)
(109, 2, 'c', 3)
(3, 3, 'a')
()
()
()
()
# and it goes on infinetly...

Your environment

• CPython versions tested on: 3.10.7
• Operating system and architecture: Windows-10, AMD64, 64bit