--- dyld/dyld-1162/cache_builder/CacheDylib.cpp
+++ dyld/dyld-1122.1/cache_builder/CacheDylib.cpp
@@ -202,7 +202,7 @@
                                      const CacheDylib& cacheDylib, std::string_view segmentName,
                                      objc_visitor::Visitor& objcVisitor)
 {
-    // rdar://113642480 (Swift has some mutable data in __objc_const)
+    // <rdar://problem/66284631> Don't put __objc_const read-only memory as Swift has method lists we can't see
     __block bool isBadSwiftLibrary = false;
     cacheDylib.inputMF->withFileLayout(diag, ^(const mach_o::Layout &layout) {
         if ( !layout.isSwiftLibrary() )
@@ -2164,18 +2164,9 @@
         if ( objcClass.getMethodCachePropertiesVMAddr(objcVisitor).has_value() )
             return;
 
-        MachOFile::PointerMetaData PMD;
-        if ( config.layout.hasAuthRegion && (objcIMPCachesOptimizer.libobjcImpCachesVersion >= 4) ) {
-            PMD.diversity         = 0x9cff; // hash of "originalPreoptCache"
-            PMD.high8             = 0;
-            PMD.authenticated     = 1;
-            PMD.key               = 2;     // DA
-            PMD.usesAddrDiversity = 1;
-        }
-
         // Set the "vtable" to point to the cache
         CacheVMAddress impCacheVMAddr = objcIMPCachesOptimizer.impCachesChunk->cacheVMAddress + impCacheOffset;
-        objcClass.setMethodCachePropertiesVMAddr(objcVisitor, VMAddress(impCacheVMAddr.rawValue()), PMD);
+        objcClass.setMethodCachePropertiesVMAddr(objcVisitor, VMAddress(impCacheVMAddr.rawValue()));
 
         // Tell the slide info emitter to slide this location
         metadata_visitor::ResolvedValue vtableField = objcClass.getMethodCachePropertiesField(objcVisitor);