Steps to reproduce:

1. Create project with QLineEdit and QTextEdit or use attached one.
2. Add placeholder text to both items.
3. Run the project on Android.

Expected: The placeholder text should be greyed out (as it is for Plain Text Edit or on other platforms - attaching a screenshot from iOS)

Actual: The placeholder text looks like prefilled text. 

Reproducibility:  100%

NOTE: It works well on Qt 5.15.12