[QDoc] Fails for template instantiation with 2 types

It seems that qdoc struggles with template instantiations with two types like the following.

QHash<QByteArray, QByteArray> 

Please see the attached error log.

The related change is this one: https://codereview.qt-project.org/c/qt/qtwebengine/+/456736.

I have run qdoc locally under Windows 11 following this guide https://wiki.qt.io/Qt_Build_System_Glossary#Documentation-only_Build. The QT_HOST_PATH variable I used pointed to Qt 6.6.0 prebuilt binaries installed via the Qt online installer. The error wasn't thrown then.

Edit: Removing the space after the comma seems to have fixed the issue, i.e., the precheck in coin went through for the aforementioned change.