Scala 3: newlines.source = keep doesn't preserve line break before then

[SethTisue]

• Version: 3.2.1
• Configuration:

version = 3.2.1
runner.dialect = scala3
newlines.source = keep

Steps

Given code like this:

class C:
  if true
  then 3
  else 4

When I run scalafmt like this:

scalafmt .

Problem

Scalafmt formats code like this:

class C:
  if true then 3
  else 4

Expectation

I would like the formatted output to be exactly the same as the input.

[SethTisue]

related: #3034