A dupe that is on the massage table when saved will walk through a gas permeable tile and get their head stuck when the save is reloaded. This happens every single time. It didn't start happening until I built insulated tiles around my crops which are at the bottom of this gif.
I've included the save before they get stuck. Development Build:CL#TU-211867
Assign a duplicant to a massage table that has a gas permeable tile to it's right a space below that tile and then another tile below that space. Save when the duplicant is using the massage table, quit or go to main menu and reload that save.