Special characters are displayed incorrectly in the EDGE browser. How to fix?

Question

css

Normal browser)

EDGE

On the site in the menu there are arrows indicating a drop-down menu.
They are displayed correctly in all browsers except EDGE.
I did not find anything on the Internet about the features of rendering special characters in EDGE.
Maybe someone faced the same problem?
Page code: style CSS code
<a href="/materials/">Материалы</a>

.navigation-header ul.menu-primary-container > li.menu-item-has-children > a:after {
content: "\2b07";
display: inline-block;
-webkit-font-smoothing: antialiased;
position: relative;
right: -7px;
top: 1px;
}

Answer 1

You haven't opened it yet on mobile phones
https://emojipedia.org/downwards-black-arrow/
Try to specify a different font, but not the fact that it will help.
If it doesn't help, then go to the pictures