https://github.com/python/cpython/issues/127012

--- contrib/tools/python3/Lib/importlib/resources/abc.py	(index)
+++ contrib/tools/python3/Lib/importlib/resources/abc.py	(working tree)
@@ -82,11 +82,11 @@ class Traversable(Protocol):
         with self.open('rb') as strm:
             return strm.read()
 
-    def read_text(self, encoding: Optional[str] = None) -> str:
+    def read_text(self, encoding: Optional[str] = None, errors: str ='strict') -> str:
         """
         Read contents of self as text
         """
-        with self.open(encoding=encoding) as strm:
+        with self.open(encoding=encoding, errors=errors) as strm:
             return strm.read()
 
     @abc.abstractmethod
--- contrib/tools/python3/Lib/importlib/resources/_functional.py	(index)
+++ contrib/tools/python3/Lib/importlib/resources/_functional.py	(working tree)
@@ -3,6 +3,7 @@
 import warnings
 
 from ._common import files, as_file
+from .abc import TraversalError
 
 
 _MISSING = object()
@@ -42,7 +43,10 @@ def is_resource(anchor, *path_names):
 
     Otherwise returns ``False``.
     """
-    return _get_resource(anchor, path_names).is_file()
+    try:
+        return _get_resource(anchor, path_names).is_file()
+    except TraversalError:
+        return False
 
 
 def contents(anchor, *path_names):