why it can't convert emoji to image

[moahmn]

i have a string like this
放大假阿卡:flushed:放大假阿卡

but the 😳 can't convert to image,why?
if string like that 放大假阿卡:flushed: or like that :flushed:放大假阿卡
it's work well.i hope your response thanks!!!

[thundergolfer]

Does it convert the :face: string at all? I have gotten this library to convert it to a <div> but the <div> is empty because the image linking doesn't work.