Issue #25395: Fixed crash when highly nested OrderedDict structures were

garbage collected.

diff --cc Lib/test/test_collections.py
Simple merge

diff --cc Misc/NEWS
index b581823558bf6616c859187609b00ea9b569c7fc,a8a1f3170a2ee142d2c93b8ff17c014b396c5836..6ce5f2d8250ee6cca5ea629a80a385f91e01ee0c
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,12 -11,9 +10,15 @@@ Release date: XXXX-XX-X
  Core and Builtins
  -----------------
  
+ - Issue #25395: Fixed crash when highly nested OrderedDict structures were
+   garbage collected.
+ 
 +- Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
 +  between 2x and 3.5x faster.
 +
 +- Issue #25399: Optimize bytearray % args using the new private _PyBytesWriter
 +  API. Formatting is now between 2.5 and 5 times faster.
 +
  - Issue #25274: sys.setrecursionlimit() now raises a RecursionError if the new
    recursion limit is too low depending at the current recursion depth. Modify
    also the "lower-water mark" formula to make it monotonic. This mark is used