HTML selection tag crashes app when clicked on

OpenBoard provides tools/widgets written in JS and HTML and executed using the QWebEngine. Some of them provide customisation options via an HTML selection (rendered as a dropdown menu).

Prior to 6.7.2, the dropdown menu is shown as intended. Starting with 6.7.2 (and also tested with 6.8.0beta3), the app crashes with a segfault when clicking on the field before the dropdown menu appears.

A run with strace produced the appended log (cut down; the click on the menu happens in line 42).

This issue has been reported in OpenBoard too: OpenBoard#1054

If I can try anything else to help fix this bug, please add a comment.
Thanks for your time,
Vekhir