Looking at the source, the tiles editor doesn’t have any logging at any point.
If you look at the KWin logs, you might see errors from the QML renderer when it tries to run the tile editor - and that may actually be the problem. On my Plasma 6.3.2 installation, there are some QML warnings that show up:
$ journalctl --user --unit plasma-kwin_wayland.service -f | grep -v 'maliit-keyboard'
Mar 02 12:11:03 vesho kwin_wayland[3357]: file:///usr/share/kwin/effects/tileseditor/qml/main.qml:153:13: QML SpinBox: Binding loop detected for property "implicitWidth":
qrc:/qt/qml/org/kde/plasma/components/SpinBox.qml:20:5
Mar 02 12:11:03 vesho kwin_wayland[3357]: file:///usr/share/kwin/effects/tileseditor/qml/main.qml:153:13: QML SpinBox: Binding loop detected for property "implicitWidth":
qrc:/qt/qml/org/kde/plasma/components/SpinBox.qml:20:5
(I’m grepping away the maliit-keyboard logs, because it is pretty noisy).