When a user opens history or diff page and his IP is blocked, there are no "Thank" link near other users' nicknames. It might seem logical: if he can't thank them, why this link is needed, but a links "Edit" and "Revert to this version" still present.
But now in Russia many ruwiki users uses proxy/VPN services, because government blocked a huge part of Western internet, including many news websites (BBC, Deutsche Welle and dozens of others), social networks (FB, Twi, Instagram), Ukrainian websites and so on, but not wiki. So, when a user with enabled VPN opens a history or diff page, he need to 1) disable VPN, 2) reload a page for "thank" links to appear, 3) thank user. Step 2 can be removed if MW engine will not hide "thank" links when user IP is blocked, like "edit" and "revert to" links.