without addons i can repro this bug too
how to reproduce
- buy smthing at the store
- open mail UI and be sure the To: field is epmty
- copy to the buffer any word with @ at the beginning
- teleport to other location to get the mail with item
- open INBOX,
take attachement and DELETE the mail
- go to SEND tab, click on the To: field and past the @word you copied before
- mouseover
a new item you got from mail and right click on it
you will see this glitch:
red color - important part