Good to know that issue's getting fixed 🙂
Cool thing is I've noticed it first and was marked as duplicate: https://bugs.mojang.com/browse/MC-134021
After running a world with such chest through an 'optimize world' option, the chest appears to be invisible; these two bugs might be correlated.
Here's the link for both versions of that world, as well as a little test world I created to check if it isn't save specific: https://drive.google.com/open?id=1qTXuqNHY1jU9NhmYYhaOjbDBPacU8shV
Also, I don't understand how is it a duplicate if I posted it earlier.
I have also been affected by this issue; this is I believe the only image I have of how my skin's body looked like, this specific mouth is nowhere to be found (and I believe the base of the skin has also changed, though I'm not completely sure).
[media]When I logged in today, my character had a different mouth, no hair and a different base equipped (Alex's). This is as close as I've been able to get with what I have right now (clothing is different, as I've changed it since taking the photo above, but I wouldn't say it's not related to the issue at hand because for whatever reason my skin was also barefoot when I logged in).
[media]What might be unrelated, but I'll mention it anyway, are two things:
I also had a classic skin preset that used a texture from my Java MC's account; it was turned into an Alex,
When going over every customisation option a lot of basic items were "locked" and had the blue arrow symbol on them, so I had to claim them (even though I'm pretty sure I owned them beforehand as they were mostly part of the free, basic items) to be able to use them again,
A lot of achievement items, although unlocked (there is an unlocked lock symbol and I have the achievement required), are not accessible - there is no button to equip them, only one to show the achievement.