Unicode Characters/Symbols no longer displaying in Photoshop

I have been a long-term user of Adobe Products for many years. I have always been able to copy/paste sentences into Photoshop which contained Unicode characters.

However, now with the latest version of Photoshop, I'm unable to do so. It just displays a blank square with an "x" inside of it. 

This never used to happen, it would always display correctly & work regardless of font. I have tried using fonts which I know for sure used to work, but now they dont - they now display the square/x too.

I have opened old files from before, and they are displaying correctly (but if I try paste the symbol into them old files now it doesn't work).

I have tried pasting the sentences with symbols into a Word document using various fonts and they all work fine and display fine. It's only Photoshop being fussy!

I have attached some screenshots which you may find useful. Is this a bug with the new versions of Photoshop? I remember being able to copy/paste without an issue in versions 15, 16, 17 & 18.

Kind regards.