Switching artifact within vowel

For the item coded at OSBA 16.4 kbit/s, there occurs a switching artifact at 4.05s, which causes a plop-like artifact and which is also visible in the spectrogram:

Commandline:

IVAS_cod -ism_sba 2 3 dm16a1s01.wav.0.csv dm16a1s01.wav.1.csv 16400 48 dm16a1s01.wav out.192
IVAS_dec binaural 48 out.192 out.wav

Items available at box.com/_EXTERNAL_IVAS_CHAR_MC/Issues/ivas-codec-issue-1382