Ok I situated where the glitch start.
My saves began to bug as soon as I reached the door opened by the orange card I took from the foreman (the guy we shot in his armchair) in the SinTek Warehouse 2 level. it's the only time my saves bug.
Does anibody detected the same glitch ?
edit : I took a screen in the loading : here is what appears
then the "overflow" message begin to spam the console, so I had to be quick while taking the screenshot.
Please solve this glitch, as it's really dumb to don't be able to save. Indeed, after that door moment, all my saves taken from this point are unloadable.