Pretty sure this is related to the duplicate checking. It looks like if its a duplicate, it just drops the object on the floor and doesn't delete it.

Direct leak of 40 byte(s) in 1 object(s) allocated from:
    #0 0x7f26620b89cf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x7f265e6988cf in os::malloc(unsigned long, MEMFLAGS, NativeCallStack const&) src/hotspot/share/runtime/os.cpp:654
    #2 0x7f265c21cc57 in AllocateHeap(unsigned long, MEMFLAGS, NativeCallStack const&, AllocFailStrategy::AllocFailEnum) src/hotspot/share/memory/allocation.cpp:42
    #3 0x7f265c21cc57 in AllocateHeap(unsigned long, MEMFLAGS, AllocFailStrategy::AllocFailEnum) src/hotspot/share/memory/allocation.cpp:52
    #4 0x7f265cae12fc in CHeapObjBase::operator new(unsigned long, MEMFLAGS) src/hotspot/share/memory/allocation.hpp:183
    #5 0x7f265cae12fc in CHeapObj<(MEMFLAGS)1>::operator new(unsigned long) src/hotspot/share/memory/allocation.hpp:237
    #6 0x7f265cae12fc in ClassLoader::create_class_path_entry(JavaThread*, char const*, stat const*, bool, bool) src/hotspot/share/classfile/classLoader.cpp:742
    #7 0x7f265cae1e35 in ClassLoader::create_class_path_entry(JavaThread*, char const*, stat const*, bool, bool) src/hotspot/share/classfile/classLoader.cpp:845
    #8 0x7f265cae1e35 in ClassLoader::update_class_path_entry_list(JavaThread*, char const*, bool, bool, bool) src/hotspot/share/classfile/classLoader.cpp:845
    #9 0x7f265cb0b09b in ClassLoaderExt::process_jar_manifest(JavaThread*, ClassPathEntry*) src/hotspot/share/classfile/classLoaderExt.cpp:235
    #10 0x7f265cad8a76 in ClassLoader::add_to_app_classpath_entries(JavaThread*, ClassPathEntry*, bool) src/hotspot/share/classfile/classLoader.cpp:830
    #11 0x7f265cae2386 in ClassLoader::update_class_path_entry_list(JavaThread*, char const*, bool, bool, bool) src/hotspot/share/classfile/classLoader.cpp:855
    #12 0x7f265cae2386 in ClassLoader::setup_app_search_path(JavaThread*, char const*) src/hotspot/share/classfile/classLoader.cpp:524
    #13 0x7f265cb08e36 in ClassLoaderExt::setup_app_search_path(JavaThread*) src/hotspot/share/classfile/classLoaderExt.cpp:79
    #14 0x7f265f0f64b4 in universe_init() src/hotspot/share/memory/universe.cpp:833
    #15 0x7f265d656c28 in init_globals() src/hotspot/share/runtime/init.cpp:123
    #16 0x7f265f083897 in Threads::create_vm(JavaVMInitArgs*, bool*) src/hotspot/share/runtime/threads.cpp:568
    #17 0x7f265da41163 in JNI_CreateJavaVM_inner src/hotspot/share/prims/jni.cpp:3588
    #18 0x7f265da41163 in JNI_CreateJavaVM src/hotspot/share/prims/jni.cpp:3674
    #19 0x7f2662831e25 in InitializeJVM src/java.base/share/native/libjli/java.c:1459
    #20 0x7f2662831e25 in JavaMain src/java.base/share/native/libjli/java.c:413
    #21 0x7f266283a708 in ThreadJavaMain src/java.base/unix/native/libjli/java_md.c:650
    #22 0x7f2661ea7fd3 in start_thread nptl/pthread_create.c:442

Indirect leak of 81 byte(s) in 1 object(s) allocated from:
    #0 0x7f26620b89cf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x7f265e6988cf in os::malloc(unsigned long, MEMFLAGS, NativeCallStack const&) src/hotspot/share/runtime/os.cpp:654
    #2 0x7f265c21cc57 in AllocateHeap(unsigned long, MEMFLAGS, NativeCallStack const&, AllocFailStrategy::AllocFailEnum) src/hotspot/share/memory/allocation.cpp:42
    #3 0x7f265c21cc57 in AllocateHeap(unsigned long, MEMFLAGS, AllocFailStrategy::AllocFailEnum) src/hotspot/share/memory/allocation.cpp:52
    #4 0x7f265cae1381 in ClassPathEntry::copy_path(char const*) src/hotspot/share/classfile/classLoader.cpp:235
    #5 0x7f265cae1381 in ClassPathZipEntry::ClassPathZipEntry(void**, char const*, bool, bool) src/hotspot/share/classfile/classLoader.cpp:287
    #6 0x7f265cae1381 in ClassLoader::create_class_path_entry(JavaThread*, char const*, stat const*, bool, bool) src/hotspot/share/classfile/classLoader.cpp:742
    #7 0x7f265cae1e35 in ClassLoader::create_class_path_entry(JavaThread*, char const*, stat const*, bool, bool) src/hotspot/share/classfile/classLoader.cpp:845
    #8 0x7f265cae1e35 in ClassLoader::update_class_path_entry_list(JavaThread*, char const*, bool, bool, bool) src/hotspot/share/classfile/classLoader.cpp:845
    #9 0x7f265cb0b09b in ClassLoaderExt::process_jar_manifest(JavaThread*, ClassPathEntry*) src/hotspot/share/classfile/classLoaderExt.cpp:235
    #10 0x7f265cad8a76 in ClassLoader::add_to_app_classpath_entries(JavaThread*, ClassPathEntry*, bool) src/hotspot/share/classfile/classLoader.cpp:830
    #11 0x7f265cae2386 in ClassLoader::update_class_path_entry_list(JavaThread*, char const*, bool, bool, bool) src/hotspot/share/classfile/classLoader.cpp:855
    #12 0x7f265cae2386 in ClassLoader::setup_app_search_path(JavaThread*, char const*) src/hotspot/share/classfile/classLoader.cpp:524
    #13 0x7f265cb08e36 in ClassLoaderExt::setup_app_search_path(JavaThread*) src/hotspot/share/classfile/classLoaderExt.cpp:79
    #14 0x7f265f0f64b4 in universe_init() src/hotspot/share/memory/universe.cpp:833
    #15 0x7f265d656c28 in init_globals() src/hotspot/share/runtime/init.cpp:123
    #16 0x7f265f083897 in Threads::create_vm(JavaVMInitArgs*, bool*) src/hotspot/share/runtime/threads.cpp:568
    #17 0x7f265da41163 in JNI_CreateJavaVM_inner src/hotspot/share/prims/jni.cpp:3588
    #18 0x7f265da41163 in JNI_CreateJavaVM src/hotspot/share/prims/jni.cpp:3674
    #19 0x7f2662831e25 in InitializeJVM src/java.base/share/native/libjli/java.c:1459
    #20 0x7f2662831e25 in JavaMain src/java.base/share/native/libjli/java.c:413
    #21 0x7f266283a708 in ThreadJavaMain src/java.base/unix/native/libjli/java_md.c:650
    #22 0x7f2661ea7fd3 in start_thread nptl/pthread_create.c:442