Prevent WordPress from convert ✔ (& other text symbols/emoji) to SVG [duplicate]

In my page content, I have the following:

<li><span class="tick">✔</span> Fully qualified and insured technicians, with over a decade of experience</li> 

On the frontend, WordPress changes the ✔ to:

<img draggable="false" role="img" class="emoji" alt="✔" src="https://s.w.org/images/core/emoji/13.0.1/svg/2714.svg"> 

I can’t change the colour of this SVG image, it is black, and we need it white.

How do I prevent the conversion of emojis to SVG?

EDIT

I’ve found this answer which says to use:

add_filter( 'emoji_svg_url', '__return_false' ); 

All that does is break the image but display the alt text in the correct format:

enter image description here

The same code remains:

<img draggable="false" role="img" class="emoji" alt="✔" src="https://s.w.org/images/core/emoji/13.0.1/svg/2714.svg">