Submodule update passes with qtbase sha dedf11a53b664c6901dd8d9656e6d7e1fb051974, but fails with the next commit, db342f42a4b00f858cb43328c9fdaff5fe2b5788 (https://codereview.qt-project.org/c/qt/qtbase/+/386738).

Current state of debugging (01.07.2022):

We get (a rather severe) stack frame corruption when calling QString::fromUtf8 (which happens implicitly in tst_qjsengine::noAccumulatorInTemplateLiteral when constructing a string from a literal).