The articulation maps are a very helpful addition, but, having done most of the hard work, Bandlab have not finished the job.
At the moment (Jan 2021 update) the articulation map only works when playing back over the beginning of the articulation section. If you move the "now" time into the middle of an articulation section, the articulation is ignored and the last articulation is used. Similary, clicking on a note in piano view plays the note, but not in the articulation defined for that note but in whatever articulation was active beforehand.
I hope that is fixed soon.