INITIAL_MEMORY requested memory cannot be released

When I release my wasm instance, The memory requested by INITIAL_MEMORY cannot be released，Here is the code I released：
I checked it using web memory monitoring tools：
My Engineering Construction CMAKE：
`set(EMSCRIPTEN_FLAGS
"-s USE_PTHREADS=1 -s PTHREAD_POOL_SIZE=4 -s \"EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap']\" -s ALLOW_MEMORY_GROWTH=1 \
-s \"EXPORTED_FUNCTIONS=['_free']\" -s MODULARIZE=1 -s MODULARIZE=1 -s EXPORT_ES6=1 -s USE_ES6_IMPORT_META=0 -s ENVIRONMENT='web,worker' \
-s TOTAL_STACK=5242880 -s TOTAL_MEMORY=134217728 -s INITIAL_MEMORY=33554432 -s USE_SDL=2 -s DISABLE_DEPRECATED_FIND_EVENT_TARGET_BEHAVIOR=0 -s USE_SDL_TTF=2 --preload-file=../simhei.ttf@simhei.ttf"
)`
emsdk version：