diff -rupN --no-dereference Python-3.10.9/Modules/_xxsubinterpretersmodule.c Python-3.10.9-new/Modules/_xxsubinterpretersmodule.c
--- Python-3.10.9/Modules/_xxsubinterpretersmodule.c	2022-12-06 19:31:21.000000000 +0100
+++ Python-3.10.9-new/Modules/_xxsubinterpretersmodule.c	2022-12-08 09:37:03.112024945 +0100
@@ -1761,7 +1761,7 @@ PyDoc_STRVAR(channelid_doc,
 "A channel ID identifies a channel and may be used as an int.");
 
 static PyTypeObject ChannelIDtype = {
-    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_xxsubinterpreters.ChannelID", /* tp_name */
     sizeof(channelid),              /* tp_basicsize */
     0,                              /* tp_itemsize */