<!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. --> Discovered while debugging !2173: the split rendering pytest [invokes the old `check_BE()` python function](https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/blob/main/tests/split_rendering/utils.py#L302) if `get_mld` is not specified. This can be slightly misleading because `check_BE()` [attempts to delay align the inputs](https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/blob/main/tests/renderer/compare_audio.py#L70) before the check, which means that a pure delay change will not be detected as nonBE. This function is still used for the HRTF binary loading testsuite and `compare_renderer_args()` (used for the refvec vs OTR tests). This should be phased out for split rendering and replaced with `cmp_pcm()`.