General navigating the RHEL v7.9 file system
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.5.6

Error message:
Invalid access to memory.

Stack trace:
(00407F47) Vcl::Comctrls::TTreeNode::ExpandItem
(000B424F) ntdll.dll
(0007AE9A) ntdll.dll.KiUserExceptionDispatcher
(00408038) Vcl::Comctrls::TTreeNode::Expand
(0040C9B9) Vcl::Comctrls::TCustomTreeView::CNNotify
(0050E430) Customdriveview::TCustomDriveView::CNNotify
(003A356D) Vcl::Controls::TWinControl::WndProc
(0040CC62) Vcl::Comctrls::TCustomTreeView::WndProc
(003A36C7) Vcl::Controls::_17122
(003A356D) Vcl::Controls::TWinControl::WndProc
(003A2A78) Vcl::Controls::TWinControl::MainWndProc
(00204C90) System::Classes::_18364
(000383D1) USER32.dll
(00027578) USER32.dll
(0002701B) USER32.dll
(000322C7) USER32.dll
(0007AE74) ntdll.dll.KiUserCallbackDispatcher
(0003FA93) USER32.dll
(00026D41) USER32.dll.SendMessageW
(00000578)bdhkm32.dll
(0001676D) bdhkm32.dll
(00011D34) bdhkm32.dll
(0009BCC6) COMCTL32.DLL
(0002ECFF) COMCTL32.DLL
(0002EBC2) COMCTL32.DLL
(001182E7) COMCTL32.DLL
(00035D77) COMCTL32.DLL
(000383D1) USER32.dll
(00027578) USER32.dll
(00026CE5) USER32.dll.CallWindowProcW
(003A3675) Vcl::Controls::TWinControl::DefaultHandler
(0050E48C) Customdriveview::TCustomDriveView::WMLButtonDown
(00204C90) System::Classes::_18364
(000383D1) USER32.dll
(00027578) USER32.dll
(00026CE5) USER32.dll.CallWindowProcW
(00539473) Dragdrop::TDragDrop::WndMethod
(00204C90) System::Classes::_18364
(000383D1) USER32.dll
(00027578) USER32.dll
(00026545) USER32.dll
(000260AB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.