In my topics the bbp-reply-permalink (that with the number like #1010) does not jump to the specific reply as soon as there are more pages.
Once a new page started, the url of all new replies permalinks on page 1 try to direct to a non-existing url on page 2, eg: /forums/topic/topicname/page/2/#post-1010. Every reply’s permalink on page 2 then tries a redirect to a non-existing url on page 1, eg /forums/topic/topicname/#post-1050.
Suspected changes in the reply order to be the fault, but deactivating the custom code to get edited replies to the top as well as setting default order of replies did not have any effect.
I remember having something similar last year with pagination. The fault was somewhere the theme and the permalink settings that did not agree with each other. Unfortunately I don’t remember how it was solved.