[2.7.3] [SVG] [STIX] changes to stretching parentheses

I was testing 2.7.3 and my visual regression tests caught the following oddity:

Reduced test case:

$${{\left( \int \int \right)}^\frac{1}{2}}. $$

Using 2.7.3 with SVG output using STIX fonts, MathJax is using stretchy parentheses - in v2.7.2 it was using Size3 parentheses.

Oddly enough

$${{\left( \int \right)}^\frac{1}{2}}. $$

is using stretchy ones in 2.7.2 as well. (But not with two integrals or any other additional content).

I'm wondering if this is expected behahvior. Size3 looks a bit better to me but I could easily be wrong.