Hello, I have read that at some point the Construction robots started to respect the cargo size technology, but only for the tiles: landfill, concrete, etc.

And yes, I have tested it with personal roboport and 1 robot — it indeed put 1+3 ties at once.

But when I have tested it with the Tech lvl15 (cargo = 1+15), then it put maximum 9 tiles at once, but not the 16.

Is it a vanilla limitation, or there is a way to fit it?

a screenshot of the test:
https://i.imgur.com/suY4pqN.png

At a glance I don't see anything I could do.
My technology effect is the same as in base.

Perhaps the tile carry bonus is a hardcoded workaround, only working with the 3 base techs.