When i destroied a wood block with a wood axe, for a second the wood block is replaced by a fake one block, after a quick second the fake one disappears and finally the wood block will dropped.
I noted that this bug it only happends when i enter in my world and the chunks still loading and when a chunks i created by a cupple of secons.
I don't know if you patched already this glitch or you wil, thanks for reading
Sorry if my english is not good becouse in am italian.