I think there was a change in rendering in the last major version, something about using css for transitions? There seems to be a weird side effect in popups that contain a graph. Graphs (SVG) don't resize. The graph turns out way too small unless I put an async delay of like 50 ms in before rendering. Which just feels dirty. It might be that the css transition completes within those 50 ms? It would be great to have popups play nice with graphs.
What is a popup and what is a graph? Yes, we have added animations in Radzen.Blazor 7.x which use CSS transitions (opacity etc.).
DialogService.OpenAsync with a line chart inside.
Sounds similar to this thread: Radzen 7, RadzenChart within RadzenTab in Dialog is rendered incorrectly on first view - #9 by Murmelmann