Fix Turnstile timeout issues with validation and submission state

Author: engram-design

src/web/assets/frontend/dist/js/captchas/turnstile.js

@@ -176,6 +176,10 @@ export class FormieTurnstile extends FormieCaptchaProvider {
     onExpired() {
         console.log('Turnstile has expired - reloading.');
 
+        // Clear submitHandler so that when Turnstile calls the callback after reset (auto-refresh),
+        // we don't accidentally re-submit the form. See: https://github.com/verbb/formie/issues/2734
+        this.submitHandler = null;
+
         if (!this.$activePlaceholder) {
             return;
         }
@@ -190,6 +194,10 @@ export class FormieTurnstile extends FormieCaptchaProvider {
     onTimeout() {
         console.log('Turnstile has expired challenge - reloading.');
 
+        // Clear submitHandler so that when Turnstile calls the callback after reset,
+        // we don't accidentally re-submit the form. See: https://github.com/verbb/formie/issues/2734
+        this.submitHandler = null;
+
         if (!this.$activePlaceholder) {
             return;
         }