While renaming an item, somewhere between the 5th and 10th position, the anvil window closes. Happens only on Windows 10 Edition and the 0.16 beta version. The video i'll provide is on a server, but i could also prove same in client side LAN multiplayer. (Android host, windows 10 is renaming).
(Renamed Sandstone to Bananastone)
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Any chance this is happening immediately after you type an "n"? Nevermind, commented before finishing reading. You typed several "n"s in Bananastone.
Based on MCPE-16614, looks like a fix is in the works. Regrets that we don't know when that fix will roll out.
A small addition: after 3 letters you have to click that text input again.