Why can't I select signatures in Yandex mail?

Question

Yandex

Hello! I observe such a glitch in the Yandex mail for the domain. There are 10 mailboxes, in one of them, which is called ( news ), I create different signatures, but I can’t switch between them, although everything is fine in other accounts, i.e. stupidly, the yellow arrow does not appear, as in the picture. I

even tried to create another new test account and delete news and re-create an account - in test everything works like clockwork, but in news the same glitches, and for one signature when adding a picture - it disappears . What is a Yandex bug and how can I fix it? As if the name news is like a stop word for them..
Maybe someone has some ideas (you need a box with that name!) In Yandex technical support, the robot first answered with a standard letter, on the second attempt they wrote that they would sort it out, and as a result, it’s been 2 weeks since they disappeared