#198 Opentype Stylistic Set not working on scaled parentheses

[Glenwing]

I am working on my own opentype math font based on TeX Gyre Schola. I have a stylistic set for enabling flattened parentheses. However, in XeTeX, only the default-sized parentheses are substituted. When larger sizes are used i.e. \left( \frac{1}{x} \right), the substitution is not performed. It does work correctly in LuaTeX, but not in XeTeX.

Normal parentheses, without stylistic set:

Stylistic set enabled, with XeTeX. Only small parens are substituted:

Stylistic set enabled, with LuaTeX. All sizes are substituted correctly:

MWE attached.

[Glenwing]

Forgot to mention:
This is XeTeX, Version 3.141592653-2.6-0.999994 (TeX Live 2022) (preloaded format=xelatex 2023.1.7)