docs: Sync changelog and add fixme note

CHANGELOG.md

@@ -83,6 +83,7 @@ The format is simplified version of [Keep a Changelog](https://keepachangelog.co
   - Fixed Keyboard is covering web page inputs
 - Increased `tryToSetForeground` delay to fix potential crashes (@nonproto)
 - Update dependency org.conscrypt:conscrypt-android to v2.5.3
+- Port upstream's download cache system
 
 ## [1.8.5.13]
 

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -199,6 +199,7 @@ class DownloadCache(
                 _isInitializing.emit(true)
             }
 
+            // FIXME: Wait for SourceManager to be initialized
             val sources = getSources()
 
             val sourceMap = sources.associate { provider.getSourceDirName(it).lowercase() to it.id }