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I just discovered a bug when I started to self hosting a two fonts, winch is Open Sans and Source Sans Pro. Open Sans will display on the small text class and middle text class, and Source Sans Pro will display for body, Means that I replaced some body and smalltext fonts winch is formerly IBM Plex Sans fonts. When I add a OpenType feature at here below...

.smalltext, .middletext {
font-family: 'Open Sans', 'Segoe UI', 'Roboto', 'Arial', sans-serif;
font-feature-settings: "ss03";
}
...then Open Sans fonts should changes the letter "I" and "J", but when I looked at homepage, I notice that Open Sans Regular has non-functioning OpenType Features even I used the latest version of Open Sans, I looked a Open Sans Bold and OpenType features are just worked fine. I am confused with this bug, could anyone help this?


The demonstration of Open Sans Regular and Bold :


Open Sans Regular:



Open Sans Bold: