Remove dynamic theme when darkreader-lock is detected early (#9914)

- Currently if `document.head` is already available to Dark Reader(and thus doesn't need to run a mutationobserver), it wouldn't remove the `darkreader-fallback` element when a `<meta name="darkreader-lock">` was found. - Resolves #9802 (reply in thread)
darkreader · Sep 24, 2022 · 830468c · 830468c
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## Unreleased
+
+- Fixes a issue where `darkreader-fallback` wasn't removed from the DOM, when Dark Reader finds a `<meta name="darkreader-lock">` element.
+
 ## 4.9.58 (Sep 22, 2022)
 
 - Remove newlines from CSS URL values, before handling them.

diff --git a/src/inject/dynamic-theme/index.ts b/src/inject/dynamic-theme/index.ts
@@ -488,6 +488,7 @@ export function createOrUpdateDynamicTheme(filterConfig: FilterConfig, dynamicTh
     isIFrame = iframe;
     if (document.head) {
         if (isAnotherDarkReaderInstanceActive()) {
+            removeDynamicTheme();
             return;
         }
         document.documentElement.setAttribute('data-darkreader-mode', 'dynamic');