The only thing that springs to mind is the category of problems to do with gonads ie ovaries and testicles. In this case, the person needs to inform the treating doctor what anatomy they have so something like abdominal pain can be treated properly. If anything, this is a disadvantage for a trans person- if they had terrible abdominal pain and couldn’t explain their situation fully, then the medical team looking after them might go looking for the wrong diagnosis because they’ve got the anatomy muddled up. This is a potential issue regardless of birth, gender or other certificates.

This sounds like an excuse to scare monger and bash the trans community rather than anything else.