stream not properly closed (NoBackendError | OSError: Too many open files)

[ne555]

import audioread

filename = 'some_audio_file.ogg'
try:
    for K in range(2048):
        with audioread.audio_open(filename) as audio:
            print(K, audio.duration)
except audioread.exceptions.NoBackendError:
    with open(filename, 'rb') as file: # OSError: [Errno 24] Too many open files
        pass

the audio is openned in a loop using with, but it seems that is not properly closed in my system it will print about 500 lines, then raises the NoBackendError and the OSError when trying to open a new file

using lsof shows lines of the form (my limit is 1024)

COMMAND   PID    USER   FD      TYPE             DEVICE SIZE/OFF     NODE NAME
python  38124 ne555 1023u     unix 0x00000000d813f451      0t0  2420780 type=STREAM (CONNECTED)

I've observed this issue with audioread.gstdec.GstAudioFile and audioread.ffdec.FFmpegAudioFile backends, couldn't test with audioread.rawread.RawAudioFile