I get the exact same crash on macOS arm64. I borrowed my wife's laptop and installed Sigil in it just to check.
The backtrace from the CrashReport is:
Code:
Thread 0 Crashed:: CrBrowserMain Dispatch queue: com.apple.main-thread
0 Sigil 0x10127eacc OPFModel::GetResourceType(QStandardItem const*) + 288
1 Sigil 0x10127eacc OPFModel::GetResourceType(QStandardItem const*) + 288
2 Sigil 0x1012683a0 BookBrowser::SuccessfullySetupContextMenu(QPoint const&) + 144
3 Sigil 0x101268254 BookBrowser::OpenContextMenu(QPoint const&) + 32
4 QtCore 0x10423b464 0x104188000 + 734308
5 QtWidgets 0x103be760c QWidget::event(QEvent*) + 3032
6 QtWidgets 0x103c6f964 QFrame::event(QEvent*) + 56
7 QtWidgets 0x103e2b2b0 QAbstractItemView::viewportEvent(QEvent*) + 1040
8 QtWidgets 0x103e9ebb0 QTreeView::viewportEvent(QEvent*) + 328
9 QtCore 0x1041f1028 QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 244
10 QtWidgets 0x103b919c4 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 220
11 QtWidgets 0x103b93588 QApplication::notify(QObject*, QEvent*) + 3596
12 QtCore 0x1041f0d54 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 292
13 QtWidgets 0x103bfbdfc 0x103b84000 + 491004
14 QtWidgets 0x103bfaed0 0x103b84000 + 487120
15 QtWidgets 0x103b919f0 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 264
16 QtWidgets 0x103b9297c QApplication::notify(QObject*, QEvent*) + 512
17 QtCore 0x1041f0d54 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 292
18 QtGui 0x104987308
The only thing I can think of is that I probably introduced this crash somehow when I added PDF Resource support which lives in the Misc Folder.
My wife's laptop has no dev tooling so I can not track this down now. But I will once I get home this evening or tomorrow morning.