Tree leaves are not appearing correctly in v1.16.0-rc7. Please see attached images which show the same area in rc6 (which displays correctly) and rc7 (which does not ).
I suspect there is an issue with the value being fed into uniform float alphaTest in the fragment shader chunkopaque.fsh, as I can work around the issue by replacing alphaTest with a hardcoded value of 0.2, which causes the leaves to appear correctly.