They weren't talking about redstone lamps being powered by adjacent copper bulbs but rather redstone dust loses its power when the power is traveling down a copper bulb.
(Edit): look at the photo submitted it clearly shows what I said. This is a issue that needs to be fixed.
Thanks for the update Jacob. But even after renaming my map, and reuploading to the realm, it still insists on using the resource packs uploaded prior.
Very frustrating. This has been an issue since 1.10.
Yes, the server is vanilla. It is on linux so I usually just use Ctrl+C or maybe it's Ctrl+X, I forget. I just logged in to restore a backup and notice it happened again. After stopping minecraft I noticed still 50% with only a small drop. I believe that maybe linux cache or linux buffer for the disk is getting filled up and not emptying. I will update this page if I find a solution. It is strange because centos is also stock with no extra software except java and minecraft.
Well, the problem I reported MC-11901 was said to be a duplicate of this problem. However, before updating I did not have the problem. I guess the bug I reported is not a duplicate then but it does seem very similar.
Many of my contraptions are broken after updating to 1.5 from 1.4.7. I hope they change this soon. :C
This is still a current issue