Windows平台Chrome伪粗体字体随尺寸出现异常轮廓问题

上方为Windows系统Chrome效果

上方为Firefox效果

问题现象 #

该问题仅在特定字号和字符下出现：当所用字体无原生粗体字重，但样式中声明了粗体时，Firefox中所有字符的伪粗体（faux-bold）显示正常，但Windows平台的Chrome浏览器（版本109.0.5414.75）会出现异常。即使仅调整微小像素的字号，异常也会随机出现或消失。

复现代码 #

<style>
body {
      line-height: 1.6;
    font-size: 16px;
    color: #212529;
  font-family:sans-serif;
  font-weight:400;
}

.ct-text-block {
  font-family:"Average";
    color: #000;
    font-weight: 700;
    margin-top: .75em;
    margin-bottom: .5px;
     font-size: 1em;
  /*change the above to font-size:1.01em to fix the issue*/
}
.larger{
  font-size:16.5px
}
</style>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Average&display=swap" rel="stylesheet"> 
<body> 
<p>This seems to only happen at certain sizes, in this case 16px, and letters (K & R) when the font in question does not have a supplied "bold" weight but one is declared in the styles. This "faux" bold is fine for all characters in Firefox, but not in Chrome (as of 109.0.5414.75) on Windows. </p>
<div id="text_block-13-57265" class="ct-text-block">
<span id="span-14-57265" class="ct-span">Here are Faux Bold  characters at 16px:AAA BBB CCC DDD EEE FFF GGGG HHHH III JJJ KK LLL MMM NN OOO PPP QQQ RRR SSS TTT UUU VVV WWW XXX YYY ZZZ</span>
</div>
<div id="text_block-13-57265" class="ct-text-block larger">
<span id="span-14-57265" class="ct-span">Here are Faux Bold  characters at 16.5px:AAA BBB CCC DDD EEE FFF GGGG HHHH III JJJ KK LLL MMM NN OOO PPP QQQ RRR SSS TTT UUU VVV WWW XXX YYY ZZZ</span>
</div>
<div style="font-size:2em" id="text_block-13-57265" class="ct-text-block">
<span id="span-14-57265" class="ct-span">2em (32px): KK RRR</span>
</div>
<div style="font-size:34px"  id="text_block-13-57265" class="ct-text-block">
<span id="span-14-57265" class="ct-span">34px: KK RRR</span>
</div>
<div style="font-size:5em" id="text_block-13-57265" class="ct-text-block">
<span id="span-14-57265" class="ct-span">5em (80px): KK RRR</span>
</div>
<div style="font-size:90px"  id="text_block-13-57265" class="ct-text-block">
<span id="span-14-57265" class="ct-span">90px: KK RRR</span>
</div>
</body>

补充说明 #

• 所用字体未本地安装，问题已在多台Win10和Win11设备上复现，并非单台设备独有。
• Mac平台下无论使用何种浏览器，均未出现该问题。

需求期望 #

希望字体在不同字符间的渲染保持一致，哪怕伪粗体的效果不够理想。伪粗体本身可能存在固有问题，但部分字符正常、部分字符随字号变化出现异常的情况过于怪异。

内容的提问来源于stack exchange，提问作者hrood