[Forge] Server-side block break animation does not advance

[deathcap]

The block break animation for other players damaging blocks does not animate on Forge servers (tested on forge-1.8.9-11.15.0.1715, works on vanilla 1.8.9 and Spigot), instead it stays on the very first stage:

compare to vanilla 1.8.9, you see all of the stages of the animation:

In both cases, using the same 1.8.9+forge-1.8.9-11.15.0.1715 client (probably not relevant, but also have installed mods/ironchest-1.8.9-6.0.121.768.jar)

[deathcap]

Maybe related to a protocol change - http://wiki.vg/index.php?title=Protocol&oldid=6003#Block_Break_Animation used to have X,Y,Z as int,int,int in 1.7 but in 1.8 it's a position bitfield x:y:z 26:12:26