title: Shader warning in 'Master': implicit truncation of vector type
body: <p>I get these warnings whenever I save changes in any shader file.
  It does not seem to relate directly to the shader files, since it works perfectly in a new project.
  Unfortunately it seems impossible to open this &quot;Master&quot; shader and edit it, double clicking the error message does not open any file.</p>
  <p><a href="https://i.stack.imgur.com/E19i2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/E19i2.png" alt="Master shader error" /></a></p>
  <p>I'm using Unity 2021.1.0b11.2079 and the Universal Render Pipeline.</p>
  <p>Does anyone know why these warnings appear and how I can solve the root issue?</p>
  <p>Thanks a lot!</p>