I've actually had experience of this. I was admitted to hospital about 3 months ago via A&E.
I'm transsexual (with diagnosed GD) but currently on a surgical waiting list. I have no GRC, but one is in "the pipeline".
My local hospital's policy states I should "automatically" be placed into a female bay, and in fact they tried to do just that. I actually refused (for obvious reasons) - which left them rather bemused as their policy also stated they couldn't put me in a male bay (and I also refused to be put in a male bay).
I ended up lying on a bed in a ward corridor for 9 hours until a side room became available.
The bed manager couldn't actually get his head around the fact that I didn't want ill/potentially vulnerable women feeling uncomfortable with me in the bay. He actually tried the whole "we could pull a curtain around...." tactic - again which I refused.
He also couldn't get his head around the fact I didn't feel safe in a male bay because of the potential risk of violence towards me from other men.
The system is ridiculous and clearly the default position is "if patient IDs as "female" / presents as "female" then patient MUST be female regardless. There is absolutely no safeguarding..
I did actually write to the hospital after the event but had a woolly response which gender/sex seemed wildly interchangeable... and this coming from a building FULL of allegedly medically trained people.