Microsoft updated Office 365 ProPlus installs to deploy Microsoft Teams along with Word, Excel etc. This change is effective with 1902 version. With many of my customers adopting Teams, this is not an issue. I also have a good number of customers who have not deployed Teams yet. For those who do not want to deploy Teams, going forward, you need to explicitly exclude it within the configuration.xml.
Mind you that, this update is happening gradually and depending on whether you are on Monthly, Targeted or Semi-annual channel, you may not see it yet, but it is coming and so be ready for the same.
You can always contact me if you need any help managing the ProPlus installation.