Grassy weed identification
This looks like crabgrass based on the photos. If the landscaper applied a crabgrass preemergent, it is possible that it may have leached out due to all the rain we received this season.
Other factors include how many applications were applied according to the label, etc. Here is our page on crabgrass and management in lawns https://extension.umd.edu/hgic/topics/crabgrass