I have noticed this a few times and I may have posted here about it, not sure.
I have pasted from a .txt file into this post but I know that links are processed so I have also done a screen shot of the .txt file.
Post
https://www.pprune.org/tech-log/625886-737ngs-have-cracked-pickle-forks-after-finding-several-jets.html#post10586917
has the following bad links in it. This seems to be an ongoing issue on pprune. I suspect that these bad links are getting created more or less automatically when posters copy links and paste them into new posts.
#11
https://www.pprune.org/!p10581584!ht...84-post11.html
(permalink)
https://www.pprune.org/!625886!https...l#post10581584
Removed the PREFIX from the (permalink)
That now WORKS
https://www.pprune.org/rumours-news/...l#post10581584
This seems to be an ongoing issue
Quoting the bad links fixes them automagically.
See post
https://www.pprune.org/tech-log/625886-737ngs-have-cracked-pickle-forks-after-finding-several-jets.html#post10588314
