One of the developers posted this CruiseControl server link:
http://lexmanos.no-ip.org/ccne….xml/ViewBuildReport.aspx
I'm not sure if this is the version with the block break fix that has been posted above or not, but, after installing this version on my server, the bucket problem went away.
Hooray! Now I can get started on my Nuclear Reactor! 
You made my day. You posted in the forum for a Classic server which is completely unrelated to Minecraft Forge.
Hahaha, they seem pretty confused about it there also.
I'll try to find the issue on the MCForge site and see if a dev is looking into it. I'll post back here if I find anything related to a possible fix.
Keep up the good work! 
Can't fix a bucket-related issue for you, seriously.
But we assume it's related, same with the inability to place stuff on IC-Blocks, with some forge/MLMP issue.
Are you in contact with those developers? Is there a timeframe for a fix? 
I'm having the same problem on my server. Makes getting a geothermal generator up and running pretty hard. 
Edit: SMP 1.64 for me. No other mods.
