tsc watch mode does not recompile correctly

[ahagelstein]

TypeScript Version: 3.2.0-dev.20181103, 3.1.6 and older

Code
Please use the attached sample project.

Steps:

• start the tsc in the root folder with tsc -w
• note: currently there is no compiler error
• goto lib1\tools\tools.interface.ts and remove the comment for title2: string;

Expected behavior:
the compiler detects the file change and generates the following output:

lib2/data.ts:7:15 - error TS2322: Type '{ title: string; }' is not assignable to type 'ITest'.
Property 'title2' is missing in type '{ title: string; }'.

7 const result: ITest = {
~~~~~~

[6:07:45 PM] Found 1 error. Watching for file changes.

Actual behavior:
the compiler detects the file change and generates a new output but without errors.
if I restart the compiler I see the expected error.

My system:
Windows 10 1803
node v10.12.0

test.zip