Access violation when importing MSG

I am trying to import MSG file(s) into a folder of an Internet Folders store (an IMAP account). When I open the target folder and execute Folder > Import > From MSG... with Load message into current folder style, MFCMapi throws access violation at:

https://github.com/microsoft/mfcmapi/blob/2973607bfd344912a368f0148990d616c617f1a6/core/mapi/mapiFile.cpp#L128

with the following call stack:

PSTPRX32.DLL!CImapSyncManager::HrSyncFolder(struct _feid *,struct IMAPIProgress *,int,int,unsigned long *)
PSTPRX32.DLL!CIMAPFolderProxy::EmIIMAPFolder::OnFolderChanged(void)
PSTPRX32.DLL!CIMAPMessageProxy::OnFolderChanged(void)
PSTPRX32.DLL!CIMAPMessageProxy::EmIIMAPMessage::CheckPoint(unsigned long)
PSTPRX32.DLL!CIMAPMessageProxy::SaveChanges(unsigned long)
MFCMapi.exe!file::LoadFromMSG::__l14::<lambda_2>::operator()()
MFCMapi.exe!file::LoadFromMSG(const std::wstring & szMessageFile={...}, IMessage * lpMessage=0x000002788542cb08, HWND__ * hWnd=0x00000000000f0c20)
MFCMapi.exe!dialog::CFolderDlg::OnLoadFromMSG::__l18::<lambda_2>::operator()()

Interestingly the message does actually appear in the store and I can see it in the Outlook, however, restarting MFCMapi and logging into a session after each file is slightly inconvenient, as I have thousands files to import.

Anything I can do? I tried to pass various flags to SaveChanges but it did not help.

(I can drag & drop the MSG files into the folder using Outlook, however, they will have received dates of the import, not of the original files.)

MFCMAPI version 16.0.0.1044
Outlook Version: 16.0.16811.20004

Start at core/mapi/mapiFile.cpp line 128 and trace file::LoadFromMSG through SaveChanges using the provided call stack. Reproduce the import into an IMAP folder with “Load message into current folder” and compare behavior with Outlook drag-and-drop. Done means importing multiple MSG files without an access violation or restarting MFCMAPI, while retaining the original message dates.