Substance Painter imports ABC mesh names for geometry masks with incorrect extra leading forward slash

When importing compatible ABC files into Substance Painter, mesh names for geometry masks come in with incorrect extra leading forward slashes.

For example, with an ABC hierarchy of…

foo
bar
baz

...the mesh names come into Substance Painter like so:

/foo
/bar
/baz

While this could be considered just an inconvenience, it causes a practical issue.  The same source exported as FBX does not result in this same extra leading forward slash; and so if a project is set up to use mesh names for geometry masks and the model is updated between ABC and FBX, then the geometry masks will not be preserved after the model update.

This can be worked-around by restricting a file to only use the model format it started with; but this seems to be a limiting restriction.