Formatting problems in an `else` conditional import

Given the following code in a .pyi file

import sys
import weakref
from typing import Any, ClassVar, overload, type_check_only

if sys.version_info >= (3, 11):
    from typing import LiteralString, Never
else:
    from typing_extensions import LiteralString
    from typing_extensions import Never

isort automatically formats it to

import sys
import weakref
from typing import Any, ClassVar, overload, type_check_only


if sys.version_info >= (3, 11):
    from typing import LiteralString, Never
else:
    from typing_extensions import LiteralString, Never  # <<< `isort`ed line

which is expected.

However, if you add additional imports below the conditional in the first example,

import sys
import weakref
from typing import Any, ClassVar, overload, type_check_only

if sys.version_info >= (3, 11):
    from typing import LiteralString, Never
else:
    from typing_extensions import LiteralString
    from typing_extensions import Never

import third_party_library  # <<< Additional import

isort no longer formats the else conditional imports:

import sys
import weakref
from typing import Any, ClassVar, overload, type_check_only


if sys.version_info >= (3, 11):
    from typing import LiteralString, Never
else:
    from typing_extensions import LiteralString  # <<< Not formatted
    from typing_extensions import Never          # <<< Not formatted

import third_party_library  # <<< Additional import

isort version: 5.10.1

isort configuration:

[settings]
lines_before_imports=1
lines_after_imports=2
extra_standard_library=typing_extensions
profile=black
multi_line_output=3
combine_as_imports=True

Reproduce the issue with isort 5.10.1 using the provided .pyi snippets and configuration. Trace the conditional-import formatting path and add a regression test covering an import after the conditional; done means the else-branch imports are combined as in the first example.