I no longer have this issue as of snapshot 17w13b, thank you so much for your quick action to this annoying problem!
I have this issue too, I was setting up a snapshot review to record for my YT channel and I couldn't label any of the chests because the signs were all invisible.
My computer runs Windows 10 and I was on the current snapshot (17w13a)
Unfortunately, it does still happen (ever since 1.0.0 and still now in 1.0.2 for me).
And my apologies for posting a duplicate issue, I had not realized that it had already been reported.
What the heck, I even searched for candle bugs and nothing came up. the search on this website is seriously broken.
Thanks for letting me know, Avoma!