I have checked this in Archicad and Microsoft Word. The text is not justified in both software when using a carriage return/paragraph break (Enter key) or at the last/only line, therefore, I would not consider these as bugs.
It is possible to justify text in Word by using a soft return/line break (Shift+Enter), however, soft returns cannot be placed in Archicad. I added a WISH-13135 to add this functionality.
I believe I am using the wrong terminology to describe what I'm trying to do. Essentially I am converting all of my resources from Autocad to Archicad and my layouts use Distributed text that equally spaces all characters to the extents of the text box. I'm not sure if Microsoft Word has this feature, but I have used it in many graphics design programs previously.
I am actually able to somewhat emulate this in Archicad if I put a space in-between each letter of each word and double space each word, but it does not work on the last line.
Screenshot of the almost workaround in Archicad using Justified text:
Screenshot from Autocad that I'm trying to emulate using Distributed text:
I've found a workaround. Simply add a space, followed by 'dummy' characters until they reach the end of the text box. This will push the 'dummy' characters to the next line and justify the content on the previous line. Note that you may need to split your text into multiple text boxes in order to align it properly. Please refer to the attached screenshot and GIF for the results.
Jan Millán Customer Enablement Specialist, Graphisoft North America Graphisoft Certified BIM Manager