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BASOP decoder asserts in ivas_dirac_dec_binaural_determine_processing_matrices_fx with OMASA rate switching bitstream from BASOP encoder

Basic info

Bug description

There is an assert in BASOP decoder when fed with a BASOP encoder OMASA LTV bitstream containing rate switching. Interop (either direction) does not crash.

Stack trace:

Screenshot_2025-04-23_at_12.12.47

Ways to reproduce

Use the command line with this rate switching pattern omasa_4obj_techs_start_384k_20frames.bin

IVAS_cod -ism_masa 4 2 ltv48_OMASA_4ISM_2TC_ISM1.csv ltv48_OMASA_4ISM_2TC_ISM2.csv ltv48_OMASA_4ISM_2TC_ISM3.csv ltv48_OMASA_4ISM_2TC_ISM4.csv ltv48_OMASA_4ISM_2TC.met -max_band fb  omasa_4obj_techs_start_384k_20frames.bin 16 ltv16_OMASA_4ISM_2TC.wav test_1650.bs
IVAS_dec BINAURAL_ROOM_IR 48 test_1650.bs 1650_ltv16_OMASA_4ISM_2TC.wav_omasa_4obj_techs_start_384k_20frames_16-48___BINAURAL_ROOM_IR.wav