steps to reproduce:
Go to control panel for avatar selection;
select "remote avatar" under avatar type;
enter url:
https://media.discordapp.net/attachments/926169345288183848/1119379533687173180/image.png?ex=65f4beed&is=65e249ed&hm=0b3b68562dd03533643b7d76bb4ee04d37692831e49cb64b05e4abbda95defd0&=&format=webp&quality=lossless
select submit
The image works in the text box to post: