Yes, the *patial* from the *new leader* is restored to *last leader* and renamed to 000000020000054E000000FB, without *partial* postfix.
>>Postgres asks for file 000000020000054E000000FB but somehow gets
>>000000020000054E000000FB.partial instead. Why?
Yes, Postgres asks for 000000020000054E000000FB and gets renamed 000000020000054E000000FB.partial (without *partial* postfix).
And, finally, the *last leader* has a local 000000020000054E000000FB.partial, with the segments needed for recovery, and 000000020000054E000000FB ( renamed 000000020000054E000000FB.partial from new leader). But 000000020000054E000000FB has a higher priority than 000000020000054E000000FB.partial
Also, the *new leader* archives full 000000030000054E000000FB of the new timeline. And this file contains the same as 000000020000054E000000FB data.