Cannot capture clutter-free web archives

This seems to happen with all URLs. Here are a few examples:

Every resulting database entry looks like this:

When I click Download (0 bytes), I am shown an error message stating that DEVONthink to Go “couldn’t download document”:

Strangely enough, these items all sync to my Mac as non-zero-byte Web internet locations, but not as clutter-free web archives. Any idea what may be causing this?