Pre released Assets

I need a little help if able, while trying to post a new world this morning I was given a notification stating I cannot post my world because I was trying to post prerelease assets, so I tried to figure out what these assets were. I found that the Primitives10x10plane_geom shape was the problem. I brought it into a sample world and tried posting it, but the same notification popped up. I will try submitting a bug report, but wanted to know if these new shapes provided in the Asset store are meant to be tested and not posted? or if this is a bug issue?I understand these are prerelease assets and wonder if there is any date provided when these assets will be released. Thank you for any assistance.