The goto_file function doesn't handle file paths with line numbers unlike :open
On a path:
'path/to/file.txt:55'
goto_file will open an empty buffer path/to/file.txt:55, which is somewhat nonsensical. (shouldn't this just error out?)

:open path/to/file.txt:55
will instead open the correct file on the expected line.
This is the behavior I would expect from marking a path and pressing gf