Due to the right-to-left mark, the screen name starting from a number is displayed to the left of "@"

[6elz]

右から左の書式方向制御文字により、数字から始まるスクリーンネームが @ の左に表示されます。
Due to the right-to-left mark, the screen name starting from a number is displayed to the left of “@”.

これは想定内の動作でしょうか？
Is this expected behavior?

For example,

screen name:
12345screen_name

code:

‌‏ ‌ @ 12345screen_name

display:
54321@screen_name

[niall]

[niall]

[niall]