So I wouldn’t worry about who does what... because the settlement cracks appear, and very quickly at that, as certain as Amen in church...
and whether there’s a bit of acrylic on it or filler or whatever... it will crack open, simply due to the fact that one material is plaster and the other is masonry made of whatever... and in the next 2-3 years the cracks will get bigger or if you (have someone) renew the joints, the cracks will come back...
so it’s totally irrelevant who does what, because it’s basically wasted effort for the next few years... once the moisture is gone you can start thinking about it...