Cabal file parse fail

caba-bug.cabal

cabal-version:       3.0
name:                cabal-bug
version:             0.1.0.0
build-type:          Simple

flag breaks
    description: Breaks parsing main-hs.

executable cabal-bug-exe
  default-language:   Haskell2010
  build-depends:      base
  -- this parses fine
  if flag(breaks)
    main-is:         Main1.hs
  else
    main-is:         Main2.hs

test-suite cabal-bug
  default-language:   Haskell2010
  build-depends:      base
  type:               exitcode-stdio-1.0
  -- this fails to parse
  if flag(breaks)
    main-is:         Main1.hs
  else
    main-is:         Main2.hs

  -- this fails to parse with the same error
  -- if flag(breaks)
  --   main-is:         Main1.hs
  --   type:            exitcode-stdio-1.0
  -- else
  --   main-is:         Main2.hs
  --   type:            detailed-0.9

  -- this works
  -- if flag(breaks)
  --   main-is:         Main1.hs
  --   type:            exitcode-stdio-1.0
  -- else
  --   test-module:     Main2
  --   type:            detailed-0.9