Zendaya's long-established political stance comes into play here.
The actress, who openly opposed Trump during the 2020 elections, had encouraged young people to vote by conducting a live broadcast with Michelle Obama at the time.
Zendaya, with such a political history, believes it's risky for her image to stand side by side on the same red carpet with the face of an advertisement that openly receives support from Trump and his team. Allegedly, she fears that if she appears in the same photograph with Sweeney, it could be perceived as endorsing her political stance.
According to backstage news from the Daily Mail, it's being discussed whether to adopt a 'Zendaya separate, Sydney separate' formula for the planned press tour for the third season of Euphoria. In other words, the issue is seen more as image and political management than a personal feud...
At present, there's no official statement from either side about the situation. However, the reluctance of the 'young star against Trump' to stand next to the 'advertisement supporting Trump' continues to fuel the gossip columns in Hollywood.