How did you even get back there??
Love this silly bug, but sorry to hear about the soft lock.
If you want to, please email me your save file to photogeist.dev@gmail.com and I'll see if I can't fix it.
I'm honestly not sure, walked near the concrete barrier to read the sign and didn't notice that it turned into a prompt to move to the other area until I clicked it. I'm guessing there's a small section where the loading zone expands past the intended area, and I just so happened to find it. I appreciate the offer to fix the save too, I'll see if I can grab that in just a few.