Distraction free writing didn't save my long post!

Hi,

I wrote a long post, clicking frequently on the Save button, using the distraction free writing mode.
I closed the browsers, reopened it, went back to wordpress, and found out that my long post hadn’t been saved. I worked on it the whole morning and I’m sure I clicked on the Save button quite often as I don’t trust the autosave function enough.
What happened?
And is there any way I can recover my job?
The post revisions are useless. There are no traces of my today changes to the post.
I checked an old ticket related to the distraction free writing implementation I believe https://core.trac.www.ads-software.com/ticket/17136
and I found that a tester had what seems to be my same issue, but apparently that was 21 months ago and this was supposed to be fixed.
Could you please help me?