A few things different since 0.0.13a_03
Ok so I noticed these things different from 0.0.13a_03 and 0.0.21a that arent mentioned in the version history. First, auto-breaking and destroying blocks by holding down left click will happen in 21a but not 13a_03. Second, although the 13a_03 diagonal sapling bug was fixed by then (sometimes a sapling in the air diagonal from a sapling on grass will never decay, fixed by 21a). There was now a new sapling bug where having selected a sapling in break mode while the sapling is dark will show the white selection box, but the sapling will visually dissapear.
Also, saplings seem to be faster to decay, but that needs more testing
Oh and the water from the world border will spread in 0.0.21a. I think this was added in 14a or somewhere btn that and 14a_08 Antermc (talk) 20:16, 27 September 2019 (UTC)