Sort of. In my test case (MC-27362) the sand is itemized, which doesn’t make any sense, but is probably better than what happened before. However, I don’t think MC-27362 is a legit duplicate of this, since it involves a sticky piston and sand swapping with a second block above the piston which isn’t present in this report.
Yes, this still happens in 1.8.1-pre3.
Attached a test case (since of course I can’t see if the main bug has any progress). Teleport to 2900, 130, 900 in the nether to trigger the problem. In this case, it’s three zombie pigmen.
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/229, l='crash-test', x=2891.89, y=55.00, z=944.30]
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/230, l='crash-test', x=2882.30, y=55.00, z=948.70]
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/231, l='crash-test', x=2893.34, y=54.00, z=947.69]
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/232, l='crash-test', x=2891.89, y=55.00, z=944.30]
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/233, l='crash-test', x=2882.30, y=55.00, z=948.70]
2013-08-01 15:38:43 [SERVER] [SEVERE] Wrong location! tm['Zombie Pigman'/234, l='crash-test', x=2893.34, y=54.00, z=947.69]
(Proposed workaround: only try to instantiate the entities once.)
Confirmed.