BUG in [Management.Automation.WildcardPattern]::Escape()?

Just a silly test:

0> $e = '[`*?]'
0> $escaped = [Management.Automation.WildcardPattern]::Escape($e)
0> $escaped
`[``*`?`]

Remarks: backtick itself is not escaped, it looks suspicious (I used to
think that escaping character has to be always escaped itself); or even
worse: backtick is escaped but * is not.. >

0> $e -like $escaped
True

This is ok, because $escaped actually represents $e. And $e should be the
only string represented by $escaped (case sensitivity does not matter in this
case). But:

0> '[`xxx?]' -like $escaped
True
0> '[`xxxx?]' -like $escaped
True
0> '[`xxxxx?]' -like $escaped
True

P.S. all mentioned characters are valid for example for key or value names
of Registry provider. BTW, currently Rename-Item has no -LiteralPath
parameter (overlook?), so there are cases when we just have to use
[Management.Automation.WildcardPattern]::Escape() (or something else for now).

--
Thanks,
Roman