xTerm.js in WKWebview encounters characters disappeared on iOS 15

The problem just appears on xTerm.js combine WKWebView. The Safari and SFSafariViewController on iOS 15 are fine.

Comparison video: https://youtu.be/R30yMe5Riao Demo code: https://github.com/dongyg/Bug-xTerm.js-WKWebView

Set rendererType: "dom" in your terminal settings.