Make QT/QML TextArea scroll to bottom

I'm having this hard time with QT/QML 5.11 over such a simple thing I almost think there's a bug in the library at this point.

I have the following code:

Flickable {    id: txflick    anchors.top: title_label.bottom    anchors.bottom: crect.bottom    anchors.right: crect.right    anchors.left: busy_ind.right    flickableDirection: Flickable.VerticalFlick    onContentYChanged: console.log("contentY_changed", this.contentY)    //contentY: txarea.contentHeight - txarea.height    interactive: false // Has no effect, contentY keeps changing to zero    TextArea.flickable: TextArea {        id: txarea        topPadding: 8        bottomPadding: 10        leftPadding: 10        rightPadding: 10        readOnly: true        text: menu_view.pwrcon.text        onTextChanged: {            console.log("text changed")            txflick.contentY = txarea.contentHeight - txflick.height            console.log("chg", txarea.contentHeight - txflick.height)            console.log(text)        }        onContentHeightChanged: {            console.log("ctheight = ___", contentHeight, height, txflick.height, txflick.contentHeight)        }        font.family: "DejaVu Sans Mono,Ubuntu Sans Mono,Noto Sans Mono"        font.bold: false        font.pixelSize:12        color: "black"        //verticalAlignment: TextInput.AlignTop        background: Rectangle { color: "lightgrey"; radius: 2;            border.width: 1; border.color: "darkgrey" }    }}

Basically the TextArea's text is linked to "menu_view.pwrcon.text", which is changed in the Python code (it's a property). When the text changes, I want it to set the flickable to the bottom of the text, so that we see the most recently added lines.

So I do

txflick.contentY = txarea.contentHeight - txflick.height

When the onTextChanged() event is fired. No issues there, I checked the numbers and it's fine (scrolling manually to the number shown with console.log() shows the contentY calculation is correct).

But it seems the component (the flickable), just after I change contentY, changes it alone back to 0 (this behavior happens only after the text height becomes bigger than the fixed height of the flickable). It's so genuinely idiotic I question whether it's a bug or intended.

In other words, right after my calculation, contentY goes back magically to zero without my intervention, which of course breaks the whole thing.

Is there anything to fix this issue?