WASM Regression: Documentviewer example crashes when opening file

The documentviewer example crashes when clicking the file open icon. Clicking File -> Open from menu shows a gray rectangle instead of file dialog.

To reproduce:
1. From Qt Creator, open the Document viewer example
2. Build against 6.7.0 beta1 single threaded WASM
3. Run application
4. Click file open icon

Expected results:
4. A file dialog is shown

Actual results:
4. Application crashes with stack overflow

Error:

Qt for WebAssembly: documentviewer
Application exit (Stack overflow! Stack cookie has been overwritten at 0x00000004, expected hex dwords 0x89BACDFE and 0x2135467, but received 0x89bacdff 0x02135467)