diff -up lib/core/src/perl/RefHash.xxs.orig lib/core/src/perl/RefHash.xxs
--- lib/core/src/perl/RefHash.xxs.orig 2022-06-06 10:35:17.689807548 +0200
+++ lib/core/src/perl/RefHash.xxs 2022-06-06 10:37:12.935663947 +0200
@@ -71,7 +71,11 @@ SV* tmp_keysv::set(SV* keysv)
Copy(obj.keyp, HEK_KEY(hekp), sizeof(SV*), char);
HEK_LEN(hekp) = sizeof(SV*);
HEK_HASH(hekp) = U32(obj.keyl >> 4); // hash value
+#if PerlVersion < 5360
HEK_FLAGS(hekp) = HVhek_UNSHARED;
+#else
+ HEK_FLAGS(hekp) = HVhek_NOTSHARED;
+#endif
sv.sv_any = &xpv;
sv.sv_refcnt = 1;
sv.sv_flags = SVt_PVIV | SVf_IVisUV | SVf_POK | SVp_POK | PmFlagsForHashKey;