I wish I could say I thought these concerns were overblown:
The law orders the Director of the Kansas Department of Revenue (which oversees the granting of driver’s licenses) to identify all people granted a driver’s license (or other ID) with a gender marker that does not correspond to the sex they were assigned at birth, a stipulation that applies almost exclusively to trans people.
It then orders that these licenses be invalidated, ordering the bearers to surrender their old licenses, at which time they will be provided a new license that has the wrong gender marker.
There is no part of that which isn't concerning.
Firstly, it requires the government to make a list of all people to whom this would apply to. Since the requirements are meant to only include a hated minority group, the government is essentially making a list of those which it views as its internal enemies.
Second, it required that the affected IDs be invalidated. This leaves those trans people who previously had safe IDs with no means of accurately representing themselves.
Since the primary means of identification for most Americans is their driver’s license, this would also mean taking away their legal right to drive a car, which is required for most daily tasks. Being able to drive is also a requirement for many jobs, and having a valid driver’s license is a requirement for many types of public services.
Third, the affected trans people would be forced to surrender their now invalidated IDs as a means of obtaining new ones. This serves to remove from circulation any existing IDs that do not misgender the trans people in question.
Lastly, these trans people will be provided with new IDs whose sex markers are based on what they were assigned at birth, rather than what their body (or appearance) would suggest today.
To an outside observer viewing such an ID seeing a person that appears to be one sex/gender, but whose ID marks them as the opposite is a dead giveaway that the person is trans. From there, they are marked out as different from the general population, and can then be treated differently based on whatever prejudices the reader sees fit or whatever discriminatory laws are relevant.