QPainter::drawPixmap showing seams

After upgrading to Qt 6.5.1 I've noticed that the drawPixmap method does not seem place pixmaps correctly when using floating point precision. The drawImage shows the same problem.

The attached project when compiled will show grid of colored pixmaps where you'll notice that at some "zoom" levels, ie. the default 0.4, seams/gaps appear.

This cannot be reproduced in Qt 5.15.10, and I haven't been able to find a workaround so it's a blocking issue for us in terms of upgrading.

I have also tested with drawRect and that does not seem to cause seams to show either.

Expected behavior:

Seams does not appear

Actual behavior:

Seams appear between some tiles..

Qt 6:

Qt 5:

Specs:

MacBook Pro (Retina, 13-inch, Early 2015)

Mac OS 12.6.7

3.1 GHz Dual-Core Intel Core i7