WebAssembly : virtual keyboard stops working after QDialog::exec()

When webassembly is run on ios, keyboard stops working on the main window after calling QDialog::exec().

This used to work with Qt6.5.6

Attached example and screen recording shows this:

Steps:

1. compile with qt 6.7.2 for webassembly
2. run the test application under iOS (iPad or iPhone)
3. write something in the mainwindow (it works)
4. select the menu command File > Test opening QDialog,
5. write some text in the QDialog and you close it
6. the virtual keyboard stop working on the main window.