memory leaks

[stsp]

My program uses libfluidsynth.
When running with leak sanitizer,
I am getting the hundreds of leaks,
like this one:

    #0 0x7fd43ec13f17 in __interceptor_calloc ../../../../src/libsanitizer/lsan/lsan_interceptors.cpp:90
    #1 0x7fd4389b47e9 in g_malloc0 (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x647e9) (BuildId: 200be351efe83301ebaffb390ac30b652a88bac1)
    #2 0x7fd3f0506c42 in g_type_create_instance (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x3ec42) (BuildId: 19ac1d7eb43d5180610b48be4eec8d1c0f810943)
    #3 0x7fd3f04e9c0f in g_param_spec_internal (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x21c0f) (BuildId: 19ac1d7eb43d5180610b48be4eec8d1c0f810943)
    #4 0x7fd3f04ea44b in g_param_spec_string (/lib/x86_64-linux-gnu/libgobject-2.0.so.0+0x2244b) (BuildId: 19ac1d7eb43d5180610b48be4eec8d1c0f810943)
    #5 0x7fd3f059f35d in _ipatch_type_prop_init (/lib/x86_64-linux-gnu/libinstpatch-1.0.so.2+0x7635d) (BuildId: df45cec54b7221f1938b3e00e29a6513421cac1a)
    #6 0x7fd3f05aa565 in ipatch_init (/lib/x86_64-linux-gnu/libinstpatch-1.0.so.2+0x81565) (BuildId: df45cec54b7221f1938b3e00e29a6513421cac1a)
    #7 0x7fd3fc2a5add in new_fluid_synth (/lib/x86_64-linux-gnu/libfluidsynth.so.3+0x3aadd) (BuildId: d2972109e904cc09b8bfebb083e8fcc561e41a91)

My program does delete_fluid_synth(synth);
and with gdb I made sure that ipatch_close()
is called from it. This seems to be not helping.

libfluidsynth3: 2.3.3-2.1
libinstpatch: 1.1.6-1