Robo Unit Spawning Bug

Playing A game today, went to build a Colossus out of robo, unit got stuck 100% built but wouldn’t spawn anywhere until i killed a pylion next to it, but it looks like there should be room for the unit to pop out. doing some testing, collusus can’t pop out of a robo if there is only 1 square but immortals can still pop out. instead of getting stuck behind buildings like smaller units, it just gets to 100& complete and then stops.