Use the "Qt Quick Controls Gallery" example in 6.10.0 to reproduce this problem. Use qt-creator to build it targeting API35. Run on phone or emulator. Select the "TextField" example from the menu. Tap on the text field once. The keyboard does not show. Tap it a second time and the keyboard shows.

If the TextField happens to be near the bottom of the screen where it would be obscured, the bug is even more obvious: on the first tap, it moves the text field up (good), but it draws a black box where the keyboard should be (see attached). The second tap on the text field brings up the keyboard as you would expect. The bug doesn't appear to affect earlier Android versions (I tested on 11 and 15, and it works ok.)