I was running around with the new copy-paste functionality (Shift+RMB to copy, Shift+LMB to paste). Now you can hold the paste option, which is what happened when I encountered the following bug:
1 Copied filter from (purple) filter inserter
2 Pasted filter onto the nearest power pole which was at that time powering said filter inserter
3 Upon pasting the filter, the power pole 'disconnected', as in, did not supply power to the filter inserter nor transfered power to subsequent power poles
AFAIK, this is a bug but feel free to correct me if I'm wrong

Cheers!
observations:
1 The filter was Uranium 235, but after some testing I came to the conclusion that it doesn't matter which filter you take, nor from which structure
2 The type of power pole did not matter
3 The power pole couldn't be 'reconnected' to the other power poles, so I had to demolish + rebuild the power pole