.MustFrame() Fails to Get Content of Lazy-Loaded Iframes

[cnscottluo]

Rod Version: v0.116.2

For iframes that load in the standard way, the .MustFrame() method can be used to retrieve their content. However, when dealing with iframes that implement lazy loading, for example:

<iframe loading="lazy" src="video-player.html" title="..."></iframe>

directly accessing the content using .MustFrame() may not work before the iframe is fully loaded. What is the recommended approach to obtain the content in such scenarios?