You know, we have betas for a reason - to get your feedback and to help us find bugs we've missed that show up in production, or using customer's data, or using the product in ways we didn't envision here at Microsoft.  Oft times, I've run into the situation where I've found a bug too late to make it into a Community Preview drop, only to find out later that a customer already had found the bug but assumed we already knew about it, worked around it in their environment and went on their merry way. 

PLEASE (intentional shouting here) don't do this!  Unless you find it documented somewhere that an issue is a known bug, PLEASE (intentional shouting again) go ahead and file it.  We NEED (ditto) your feedback!

For those of you unfamiliar with the process, you start filing bugs here