The webfont of “Source Han Serif Simplified Chinese” (SHSerif-SC) lacks of the character “喻” (U+55BB) when it is fetched through the dynamic subsetting mode.
Please check out the demo: https://codepen.io/realfish/pen/abEgOXq
In this demo, the highlighted character is the “喻” (U+55BB) which is not rendered by the SHSerif-SC (but rendered by some system font as fallback), while the “比” is rendered correctly as a comparison.