pyinstaller-frozen app including shapely on Mac fails to find libgeos dylib in conda environment

On Mac, when using pyinstaller to freeze an app which uses shapely, the frozen app fails to run when the user is in an Anaconda/miniconda environment. The problem (at least in 1.7.1 and 1.8.0) is in shapely/geos.py:

    # Test to see if we have a delocated wheel with a GEOS dylib.
    geos_whl_dylib = os.path.abspath(os.path.join(os.path.dirname(
        __file__), '.dylibs/libgeos_c.1.dylib'))

    if os.path.exists(geos_whl_dylib):
        handle = CDLL(None)
        if hasattr(handle, "initGEOS_r"):
            LOG.debug("GEOS already loaded")
            _lgeos = handle
        else:
            _lgeos = CDLL(geos_whl_dylib)
            LOG.debug("Found GEOS DLL: %r, using it.", _lgeos)

    elif os.getenv('CONDA_PREFIX', ''):
        # conda package.
        _lgeos = CDLL(os.path.join(sys.prefix, 'lib', 'libgeos_c.dylib'))
    else:
        if hasattr(sys, 'frozen'):
            try:
                # .app file from py2app
                alt_paths = [os.path.join(
                    os.environ['RESOURCEPATH'], '..', 'Frameworks',
                    'libgeos_c.dylib')]
            except KeyError:
                # binary from pyinstaller
                alt_paths = [
                    os.path.join(sys.executable, 'libgeos_c.dylib')]
                if hasattr(sys, '_MEIPASS'):
                    alt_paths.append(
                        os.path.join(sys._MEIPASS, 'libgeos_c.1.dylib'))
        else:
            alt_paths = [
                # The Framework build from Kyng Chaos
                "/Library/Frameworks/GEOS.framework/Versions/Current/GEOS",
                # macports
                '/opt/local/lib/libgeos_c.dylib',
                # homebrew
                '/usr/local/lib/libgeos_c.dylib',
            ]
        _lgeos = load_dll('geos_c', fallbacks=alt_paths)

The presence of a conda environment is checked before the probe for the frozen environment; I'm pretty sure it should be the other way around.

Expected behavior and actual behavior.

Expected behavior is that the app should run without incident. Actual behavior is the following error:

Traceback (most recent call last):
  File "PyInstaller/loader/pyimod04_ctypes.py", line 53, in __init__
  File "ctypes/__init__.py", line 364, in __init__
OSError: dlopen(/Users/sam/Desktop/mainV3.app/Contents/MacOS/lib/libgeos_c.dylib, 6): image not found

Steps to reproduce the problem.

• create an app using pyinstaller which uses shapely and imports shapely.geos.
• activate a conda environment (base environment is fine)
• run the frozen app

Operating system

MacOS 11.6.3.

Shapely version and provenance

Version 1.7.1, installed from pypi. However, I've confirmed visually that the same incorrect checking order is present in the 1.8.0 source code.