[[https://zh.wikipedia.org/wiki/User:Qsx753698|User:Qsx753698]] on Chinese Wikipedia reported that s/he cannot enable Flow on the user talk page. The tool have moved the original discussions to the subpage but did not enable Flow afterwards. After some retries, the tool have enabled Flow on the subpage [[https://zh.wikipedia.org/wiki/User talk:Qsx753698/Flow 存档 1]] instead.
After checking [[https://zh.wikipedia.org/wiki/Special:Contributions/Flow_talk_page_manager]], there are some more similar cases.
I have not tried to reproduce the problem.
Please consider investigating. Thanks in advance.