The TextField component seems to always omit the last character of the contained text. When introducing additional Accessibility properties (e.g. Accessible.name and Accessible.description) the incomplete text content is still read by VoiceOver (alongside the complete text assigned to Accessible.name). So the text is echoed twice, where the second time is incomplete, the specified description is not read at all.

Minimal example:

TextField {
    Accessible.role: Accessible.StaticText
    Accessible.name: text
    Accessible.description: qsTr("Textfield containing text: ") + text
    
    text: qsTr("Some text")
    readOnly: true
}