Retrieved from
https://github.com/NixOS/nixpkgs/raw/master/pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch

diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index 1d66e75..827567a 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -727,7 +727,7 @@ bool QQmlTypeLoader::Blob::isDebugging() const
 
 bool QQmlTypeLoader::Blob::diskCacheEnabled() const
 {
-    return (!disableDiskCache() && !isDebugging()) || forceDiskCache();
+    return forceDiskCache();
 }
 
 bool QQmlTypeLoader::Blob::qmldirDataAvailable(const QQmlRefPointer<QQmlQmldirData> &data, QList<QQmlError> *errors)