Unable to use arabic unicode in between English captions,

I'm unable to use arabic unicode like 'ﷺ' in between of regular English captions. For eg: the following caption:

" The Prophetﷺ said, actions are judged by their intention...."

I was able to use these in fonts like kefa, muller medium etc before the new caption flow update came, but now when I use, they come empty in some fonts and some place ﷺ is replaced by a box. Please resolve this asap as I'm doing subtitiles. for video and is part of my job.

Thanks