Strange parameter visibility

[kjonca@xxxxx (Kamil Jońca)]

--8<---------------cut here---------------start------------->8---
%(x=1; x=2 echo | echo $x ; echo $x) 
1
1
--8<---------------cut here---------------end--------------->8---

but :
--8<---------------cut here---------------start------------->8---
%(x=1; x=2 | echo $x ; echo $x) 
2
2
--8<---------------cut here---------------end--------------->8---

What there are "2"-s in second example?
should'n "x=2" be treated as simple null command with its own
assignement?
KJ

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