syncContents command when remote controlling Qt Assistant does not go to correct page

I am using -enableRemoteControl when creating a QProcess for Qt Assistant. When my application navigates to another page, I am calling setSource and syncContents. It appears that syncContents sets the contents pane to the *previous* page, not the current page.

I am writing the "change page" logic like this:

QByteArray ba;
ba.append(QLatin1String("setSource qthelp://org.sphinx.Literacy.1.0/doc/"));
ba.append(page);
ba.append(QLatin1String(".html"));
ba.append('\0');
process_->write(ba);
ba.clear();
ba.append(QLatin1String("syncContents"));
ba.append('\0');
process_->write(ba);

I have tried this both as separate commands (as above) as well as one command, chaining them together with semicolon. There is no difference.