[GENERAL] requested timeline doesn't contain minimum recovery point

there is something happening in my replication that is not clear to me. I think I'm missing something.

I've two server, red and blue.

red is primary blue is standby, async repl.

Now:

1 cleanly stop red

2 promote blue

3 insert tuples in blue

4 from red site, pg_rewind from blue to red dir.

5 start red as standby-> OK

6 wait a long time and then cleanly stop blue

7 promote red

8 insert tuples in red

9 from blue site, pg_rewind from red to blue dir

10 start blue as standby -> I get "requested timeline 3 doesn't contain minimum recovery point 1/... on timeline 1

Sometimes this "switching game"  works up to timeline 4 or 5, not always 3

Regards

Pupillo