Torchscript made in PyTorch 1.7 not loading on 1.4

converted a model (VGG19 + with just 1 FC layer) using PyTorch 1.7, when I load it on a container with 1.4, it fails to load with a “version too old” error.
Is this the intended behavior?

RuntimeError: version_ <= kMaxSupportedFileFormatVersion INTERNAL ASSERT FAILED at /pytorch/caffe2/serialize/, please report a bug to PyTorch. Attempted to read a PyTorch file with version 4, but the maximum supported version for reading is 2. Your PyTorch installation may be too old. (init at /pytorch/caffe2/serialize/

torchscript maintains backward compatibility, not forward compatibility.