Parallel seam between drywall and plastered brick

Most of the interior walling in my house that is under construction is using single skin brick with plaster.

In a few locations we require "cavity" doors and space has been left in the brickwork for the cavity, the intention is that the cavity will constructed using drywall (or potentially wedi board) quite possibly using a pc henderson "pocket door" kit for the framing.

One of the people I’ve come out to quote on the dooring has expressed concern about the join between the "plaster board" and the plastered brickwork – in his opinion it is likely a crack will keep forming here.

I was wondering firstly how valid a concern this really is, if done properly is it likely a crack will still form?

And secondly I was wondering what the best practice here would be.
The cavity system comes in different widths… Would it be better to try match the "finished wall thickness" of the cavity + plasterboard to the "finished wall thickness" of the brickwork + plaster, and then just do a thin skim to join them.

Or would it be better to rather have the cavity + plasterboard be approximately the same thickness as the brick and then apply a thick plaster over both to join them?

Any other tips to prevent hassles?

I’ve done a little explanation drawing (brick part not really to scale or anything like that, just to give an idea.

Picture of one of the brick walls with space for door cavity (roughly half of this will become a door opening) the other half will be framed for door to slide into.

(Sorry not the best picture, I’ll try get a better one when next on site.