I've created a custom widget with inappwebview, and now it works:
add this to your pubspec: flutter_inappwebview: ^6.1.5
i pass html Content, but you can adjust to use url instead.

this is my widget code:( use it instead of the builtin webview)
// Automatic FlutterFlow imports\nimport '/backend/backend.dart';\nimport '/backend/schema/structs/index.dart';\nimport '/flutter_flow/flutter_flow_theme.dart';\nimport '/flutter_flow/flutter_flow_util.dart';\nimport '/custom_code/widgets/index.dart'; // Imports other custom widgets\nimport '/custom_code/actions/index.dart'; // Imports custom actions\nimport '/flutter_flow/custom_functions.dart'; // Imports custom functions\nimport 'package:flutter/material.dart';\n// Begin custom widget code\n// DO NOT REMOVE OR MODIFY THE CODE ABOVE!\n\nimport 'package:flutter_inappwebview/flutter_inappwebview.dart';\n\nclass InAppWebViewCustom extends StatefulWidget {\n  const InAppWebViewCustom({\n    super.key,\n    this.width,\n    this.height,\n    required this.htmlContent,\n  });\n\n  final double? width;\n  final double? height;\n  final String htmlContent;\n\n  @override\n  State<InAppWebViewCustom> createState() => _InAppWebViewCustomState();\n}\n\nclass _InAppWebViewCustomState extends State<InAppWebViewCustom> {\n  late InAppWebViewController _webViewController;\n  double progress = 0;\n  bool isLoading = true;\n\n  @override\n  Widget build(BuildContext context) {\n    return Container(\n      width: widget.width,\n      height: widget.height,\n      child: Stack(\n        children: [\n          InAppWebView(\n            initialData: InAppWebViewInitialData(\n              data: widget.htmlContent,\n              mimeType: 'text/html',\n              encoding: 'utf-8',\n            ),\n            initialOptions: InAppWebViewGroupOptions(\n              crossPlatform: InAppWebViewOptions(\n                javaScriptEnabled: true,\n                useShouldOverrideUrlLoading: true,\n                mediaPlaybackRequiresUserGesture: false,\n                supportZoom: false,\n                verticalScrollBarEnabled: true,\n                horizontalScrollBarEnabled: true,\n                javaScriptCanOpenWindowsAutomatically: true,\n              ),\n              android: AndroidInAppWebViewOptions(\n                useHybridComposition: true,\n                domStorageEnabled: true,\n                databaseEnabled: true,\n              ),\n              ios: IOSInAppWebViewOptions(\n                allowsInlineMediaPlayback: true,\n              ),\n            ),\n            onWebViewCreated: (InAppWebViewController controller) {\n              _webViewController = controller;\n            },\n            onLoadStart: (controller, url) {\n              if (mounted) {\n                setState(() {\n                  isLoading = true;\n                });\n              }\n            },\n            onLoadStop: (controller, url) async {\n              if (mounted) {\n                setState(() {\n                  isLoading = false;\n                });\n              }\n            },\n            onProgressChanged: (controller, progress) {\n              if (mounted) {\n                setState(() {\n                  this.progress = progress / 100;\n                });\n              }\n            },\n            onConsoleMessage: (controller, consoleMessage) {\n              print(\"WebView Console: ${consoleMessage.message}\");\n            },\n            onLoadError: (controller, url, code, message) {\n              if (mounted) {\n                setState(() {\n                  isLoading = false;\n                });\n                print(\"WebView Error: $message\");\n              }\n            },\n          ),\n          if (isLoading)\n            Center(\n              child: CircularProgressIndicator(\n                value: progress,\n                valueColor: AlwaysStoppedAnimation<Color>(\n                  FlutterFlowTheme.of(context).primary,\n                ),\n              ),\n            ),\n        ],\n      ),\n    );\n  }\n}
Webview refresh on resize
