Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7

Error message:
External exception EEFFACE

Stack trace:
[770CB727] KERNELBASE.dll.RaiseException
[77568786] ntdll.dll
[7752010A] ntdll.dll.KiUserExceptionDispatcher
[012567E0] Jclhookexcept::_16408
[015A0E32] C4725_0
[015A217C] _ThrowExceptionLDTC
[015861AC] C2769_0
[01495D69] TSFTPFileSystem::ReceivePacket
[014970DC] TSFTPFileSystem::ReceiveResponse
[014972D9] TSFTPFileSystem::SendPacketAndReceiveResponse
[01497741] TSFTPFileSystem::RealPath
[01497E6E] TSFTPFileSystem::RealPath
[014A6175] TSFTPFileSystem::ChangeDirectory
[014D7C7E] TTerminal::ChangeDirectory
[013D3D53] TUnixDirView::ChangeDirectory
[013D2216] TUnixDirView::ExecuteParentDirectory