Error "Unable to pack the files" while running slPacker.Pack in TestComplete 12

Since TestComplete 12, the archiver retuns an error while packing the log folder.

For example, using the code

L_strWorkDir = "C:\temp\TestPack2"

L_strFileList = slPacker.GetFileListFromFolder(L_strWorkDir)

L_strArchive = "C:\temp\TestPack2.zip"

lPacker.Pack(L_strFileList, L_strWorkDir, L_strArchive)

TestPack2 includes only "Log.mht" and the TestComplete "log" folder of our test. The code above returns the error "Unable to pack the files", with additional info:

The archiver has returned an error.
The archiver output:
Warning: ZIPDLL.DLL version 1.73.3.0, September 27, 2003 is newer
File specification "log\ico_success.giff" skipped
File specification "C:\temp\TestPack2\" skipped
File specification "C:\temp\TestPack2\" skipped
File specification "C:\temp\TestPack2\" skipped
File specification "C:\temp\TestPack2\" skipped
File specification "log\table.jss" skipped
File specification "log\table.jss" skipped
File specification "C:\temp\TestPack2\" skipped
File specification "l" skipped
File specification "log\text.jss" skipped
  adding: Log.mht
  adding: log\_ProjectLog.js

Note: the log folder includes a table.js file, not a table.jss file as printed in the generated error message above.

I didn't find a minimal folder/subfolder configuration, that always reproduces the problem.

It looks like a bug in version 12. Have others experienced the same problem?