Quartus Prime Pro 20.4.0: Problem Report (schematic,symbol,fill color)

Schematic entry:
Right click on symbol -> Symbol Properties -> Format -> Fill
removed hook from checkbox "No Fill"
=> when clicking in OK, Quartus Prime Pro 20.4.0 crashes with the "Sorry!" window.
I did a crosscheck with version 19.4 Pro: no issues there.

Here is resulting Problem Report:

Problem Details
Error:

*** Fatal Error: Access Violation at 00007FF8E12D9D80

Module: quartus.exe

Stack Trace:

  Quartus         0x309d7f: QFutureWatcherBase::`vftable' + 0xe7 (Qt5Core)

  Quartus          0x16296: GDLGQ_FORMAT_PAGE::set_properties + 0x356 (EDT_GDLGQ)

  Quartus          0x2bb8e: GDLGQ_SYMBOL_PROPERTY_SHEET::set_properties + 0x10e (EDT_GDLGQ)

  Quartus          0x94d85: GEDQ_PROPERTIES_COMMAND::GEDQ_PROPERTIES_COMMAND + 0x375 (edt_gedq)

  Quartus          0xade9c: GEDQ_SYMBOL::do_properties + 0x1ec (edt_gedq)

  Quartus          0x6e091: GEDQ_GLYPH_COLLECTION::do_properties + 0x381 (edt_gedq)

  Quartus         0x1f8146: QMimeData::urls + 0x13a6 (Qt5Core)

  Quartus           0x6bf6: QAction::activate + 0x136 (Qt5Widgets)

  Quartus         0x1603d7: QMenu::actionGeometry + 0x457 (Qt5Widgets)

  Quartus         0x160245: QMenu::actionGeometry + 0x2c5 (Qt5Widgets)

  Quartus         0x1659a8: QMenu::mouseReleaseEvent + 0xb8 (Qt5Widgets)

  Quartus          0x39b25: QWidget::event + 0x145 (Qt5Widgets)

  Quartus         0x161b3b: QMenu::event + 0x17b (Qt5Widgets)

  Quartus          0x176fc: QApplicationPrivate::notify_helper + 0x13c (Qt5Widgets)

  Quartus          0x15340: QApplication::notify + 0x8b0 (Qt5Widgets)

  Quartus         0x1d8088: QCoreApplication::notifyInternal2 + 0xb8 (Qt5Core)

  Quartus          0x18a61: QApplicationPrivate::sendMouseEvent + 0x331 (Qt5Widgets)

  Quartus          0x6188b: QSizePolicy::QSizePolicy + 0x288b (Qt5Widgets)

  Quartus          0x5f9fd: QSizePolicy::QSizePolicy + 0x9fd (Qt5Widgets)

  Quartus          0x176fc: QApplicationPrivate::notify_helper + 0x13c (Qt5Widgets)

  Quartus          0x165bc: QApplication::notify + 0x1b2c (Qt5Widgets)

  Quartus         0x1d8088: QCoreApplication::notifyInternal2 + 0xb8 (Qt5Core)

  Quartus          0x5b35e: QGuiApplicationPrivate::processMouseEvent + 0x81e (Qt5Gui)

  Quartus          0x46ae3: QWindowSystemInterface::sendWindowSystemEvents + 0xa3 (Qt5Gui)

  Quartus         0x2252d6: QEventDispatcherWin32::processEvents + 0x66 (Qt5Core)

  Quartus          0x59568: qt_plugin_query_metadata + 0x1e68 (qwindows)

  Quartus         0x1d3f90: QEventLoop::exec + 0x1a0 (Qt5Core)

  Quartus         0x162007: QMenu::exec + 0x1c7 (Qt5Widgets)

  Quartus         0x161dfa: QMenu::exec + 0x1a (Qt5Widgets)

  Quartus          0xb04e3: GEDQ_SYMBOL::on_context_menu + 0x393 (edt_gedq)

  Quartus          0x6d912: GEDQ_GLYPH_COLLECTION::do_context_menu + 0x1a2 (edt_gedq)

  Quartus          0xbcd9a: GEDQ_VIEW::contextMenuEvent + 0xba (edt_gedq)

  Quartus          0x3a114: QWidget::event + 0x734 (Qt5Widgets)

  Quartus          0x176fc: QApplicationPrivate::notify_helper + 0x13c (Qt5Widgets)

  Quartus          0x15b26: QApplication::notify + 0x1096 (Qt5Widgets)

  Quartus         0x1d8088: QCoreApplication::notifyInternal2 + 0xb8 (Qt5Core)

  Quartus          0x620c9: QSizePolicy::QSizePolicy + 0x30c9 (Qt5Widgets)

  Quartus          0x5f9fd: QSizePolicy::QSizePolicy + 0x9fd (Qt5Widgets)

  Quartus          0x176fc: QApplicationPrivate::notify_helper + 0x13c (Qt5Widgets)

  Quartus          0x165bc: QApplication::notify + 0x1b2c (Qt5Widgets)

  Quartus         0x1d8088: QCoreApplication::notifyInternal2 + 0xb8 (Qt5Core)

  Quartus          0x5b35e: QGuiApplicationPrivate::processMouseEvent + 0x81e (Qt5Gui)

  Quartus          0x46ae3: QWindowSystemInterface::sendWindowSystemEvents + 0xa3 (Qt5Gui)

  Quartus         0x2252d6: QEventDispatcherWin32::processEvents + 0x66 (Qt5Core)

  Quartus          0x59568: qt_plugin_query_metadata + 0x1e68 (qwindows)

  Quartus         0x1d3f90: QEventLoop::exec + 0x1a0 (Qt5Core)

  Quartus         0x1d6d7a: QCoreApplication::exec + 0x14a (Qt5Core)

  Quartus           0x10c8: qgq_main + 0x88 (quartus)

  Quartus          0x16808: msg_main_thread + 0x18 (CCL_MSG)

  Quartus          0x17021: msg_thread_wrapper + 0x71 (CCL_MSG)

  Quartus          0x21610: mem_thread_wrapper + 0x70 (ccl_mem)

  Quartus          0x14b9d: msg_exe_main + 0x20d (CCL_MSG)

  Quartus           0x20d6: WinMain + 0x156 (quartus)

  Quartus           0x16e2: __scrt_common_main_seh + 0x116 (quartus)

  Quartus          0x17bd3: BaseThreadInitThunk + 0x13 (KERNEL32)

  Quartus          0x6ce50: RtlUserThreadStart + 0x20 (ntdll)

End-trace

Executable: quartus
Comment:
Schematic entry:

Right click on symbol -> Symbol Properties -> Format -> Fill

removed hook from checkbox "No Fill"

=> when clicking in OK, Quartus Prime Pro 20.4.0 crashes with the "Sorry!" window.

I did a crosscheck with version 19.4 Pro: no issues there.

System Information
Platform: windows64
OS name: Windows 10
OS version: 10.0

Quartus Prime Information
Address bits: 64
Version: 20.4.0
Build: 72
Edition: Pro Edition