Inlined functions look wrongly formatted

let editor =
    Tiptap.Editor.use(
      ~provider,
      ~document=ydoc,
      ~renderCursor=CollaborationCursor.renderCursor,
      ~user=initialUser,
      ~onCreate=({editor}: Tiptap.createProps) => {
         onCreateEditor(editor)
      }
   );

Gets formatted to

let editor =
    Tiptap.Editor.use(
      ~provider,
      ~document=ydoc,
      ~renderCursor=CollaborationCursor.renderCursor,
      ~user=initialUser,
      ~onCreate=({editor}: Tiptap.createProps) => {
      onCreateEditor(editor)
    });

Start by reproducing the formatter with the Reason snippet in the issue and compare the input with the shown output. Trace the formatting behavior for the inline callback and surrounding closing delimiters; done means the formatter preserves the intended indentation shown in the example.