Over-aggresive folding breaks nested lambda expressions

[SteveGilham]

Description

After processing with 3.0.0-beta 4, the function starts at line 423 of the containing file; at that point these intellisense errors are shown

The type ''b -> 'c' is not compatible with the type 'seq<'a>'. See also Visitor.fs(425,7)-(425,18). Visitor.fs 427
This expression was expected to have type
''a -> 'b'
but here has type
'Node' Visitor.fs 446

Also identifiers targets and included are greyed out as if unreferenced.

Repro code

example

[nojaf]

The formatted code (of 03/01/2020) produces valid code/AST for me.

Please reopen if this is still a problem.