Only cancel the install of the extension being cancelled

CHANGELOG.md

@@ -42,6 +42,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - Fixed a crash when updating an extension while others were installing ([@AntsyLich](https://github.com/AntsyLich))
 - Fixed library entries without a date added getting their last update time as date added when updating from v0.20.x ([@AntsyLich](https://github.com/AntsyLich))
 - Fixed the app closing when WebView's page process crashed ([@AntsyLich](https://github.com/AntsyLich))
+- Fixed installing or updating an extension sometimes cancelling the install of another one ([@AntsyLich](https://github.com/AntsyLich))
 
 ## [v0.21.0] - 2026-10-12
 ### Added

app/src/main/java/eu/kanade/tachiyomi/extension/installer/Installer.kt

@@ -127,8 +127,10 @@ abstract class Installer(private val service: Service) {
      */
     private fun cancelQueue(downloadId: Long) {
         val waitingInstall = this.waitingInstall.load()
+        // Every new install cancels its own previous attempt first, which mustn't hit another extension's install
         val toCancel = synchronized(queue) { queue.find { it.downloadId == downloadId } }
-            ?: waitingInstall ?: return
+            ?: waitingInstall?.takeIf { it.downloadId == downloadId }
+            ?: return
         if (cancelEntry(toCancel)) {
             queue.remove(toCancel)
             if (waitingInstall == toCancel) {