[Reg 16.0.1 -> 17.0.0b1] Custom Qt Quick code style is now ignored

Problem 1: Built-in formatter
I'm using the same (now-deprecated) built-in formatter for QML code, and I kept the style unchanged between Qt Creator 16.0.1 and 17.0.0-beta1:

However, Qt Creator now seems to ignore the style settings. When I open a *.qml file in the code editor and press the [Tab] key...

• Qt Creator 16.0.1 inserts a tab character (Expected)
• Qt Creator 17.0.0-beta1 inserts 4 space characters (Not Expected)

Problem 2: qmlformat (LSP)
Next, I tried the new qmlformat functionality and applied UseTabs=true. Is that correct? I'm not sure (QTCREATORBUG-32964), but the preview pane seems to accept this setting:

I used a Qt 6.8.3 kit and enabled qmlls. However, just like Problem 1, pressing the [Tab] key still produces 4 space characters instead of a tab character in Qt Creator 17.0.0-beta1.