Why does the lib mode package process fail to convert the image referenced by the style in the Vue template into base64 format?

[codelzb]

<div class="the-head" style="background: url('./images/XXX.jpg'); height: 60px">
The effect after packaging with the library mode is shown in the figure below. According to the document's description, it should be inlined and converted to base64. (按照文档介绍 应该会内联并转为base64)