KaTeX math block with auto scaling will not align tags correctly

[yhatt]

Reported in marp-team/marp#124.

the tag of a mathematic formula will cover the formula, can we solve it ?
Example, the formula is
$$
x^n+y^n=z^n \tag{1}
$$
the preview is

.tag class has styled by position: absolute. The parent container data-marp-fitting-svg-content for detecting the width before applying scale will not consider the width of tag.