The problem is likely lag.
Specifically, there is a small window of opportunity between when you are able to cast (when you gain the extra chakra) and when you are unable (end of turn or tenten being CCed)
What you see happening on your end is not what is happening real time in the server. Now, with a superb connection (and ISP that require minimal hops), this can be low as 0.5 second on 1x. Still, the "server" will be ahead of where you are at.
So if the delay is so large such that by the time you meet the condition on your end (getting the chakra), the server is ahead sufficiently such that the "no longer possible" (note that in case where the CC happen as a chase chain, this means the start of that chain)
Unfortunately, Xserver masuri just made the delay bigger, even with good connection (I get