getReorderedString of mixed RTL, LTR and Emoji text sometimes differs from browser bidi behavior

[tombigel]

When passing a mixed RTL, LTR and Emoji string to getReorderedString, if the sentence is processed as rtl, and the emoji is right after an LTR block it seems like it will be considered as a part of the LTR block, while the browser seems to considers it as a new RTL block (I'm not sure I'm 100% familiar with the implementation to use the right terms here):

if the original string is
RRR LLL N (where N is the Emoji) The browser will Render it (in a "direction: rtl" block) as N LLL RRR but bidi.js will return LLL N RRR

if the original string is
RRR LLL R N
both the browser and bidi.js will render it as N R LLL RRR

a codepen demo: https://codepen.io/tombigel/pen/gOJYQom

Is it expected?