To reproduce:
1. Install `qt6-quick-effect-maker`
2. Run `qqem6`

Console output:
jack@localhost:~> qqem6 
QQmlApplicationEngine failed to load component
qrc:/qml/main.qml:275:5: Type SaveProjectDialog unavailable
qrc:/qml/SaveProjectDialog.qml:8:1: Type CustomDialog unavailable
qrc:/qml/CustomDialog.qml:9:5: Non-existent attached object

System information:
Operating System: openSUSE Tumbleweed 20240403
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.3
Kernel Version: 6.8.2-1-default (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-5200U CPU @ 2.20GHz
Memory: 8.2 GB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5500
Manufacturer: Dell Inc.
Product Name: Inspiron 5749
System Version: A09