If the OP namechanges part way through their thread, "see next"/"see all" reveals the namechanges.

[Lougle]

Is this intentional? Sometimes posters have a namechange fail, but if you link the namechanges in the "see next"/"see all" then their other posts can be searched very easily.

Hi Lougle

We are looking into this right now.
Please could you PM me a thread example of where this has happened?

Hi Lily, I've done that. Thanks for looking into it.

Hello!

We can confirm that if an OP changes their username to a completely different one mid-thread and they post on that thread again, their post won’t appear in ‘See all’. The reason why we can see posts not from the OP username is because they used the exact same username with slightly different letter cases.

That's good to hear. Thanks @LilyMumsnet