[Firefox]adjacent <mi> extra space in between

hbghlyj

Comparing$$\mathrm{i}\sin$$ and $$\mathrm{i}s$$ with $$i\sin$$ and $$𝑖\mathit{sin}$$

1. Comparing<math display="block">
2. <mi mathvariant="normal">i</mi>
3. <mi>sin</mi>
4. </math>
5. with
6. <math display="block">
7. <mi>i</mi>
8. <mi>sin</mi>
9. </math>
10. and
11. <math display="block">
12. <mi>𝑖</mi>
13. <mi mathvariant="italic">sin</mi>
14. </math>

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In Firefox: Two adjacent <mi> if one is italic and the other is normal, have extra space in between $$is$$

1. <math display="block">
2. <mi>i</mi>
3. <mi>s</mi>
4. </math>

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hbghlyj

MathML generated by MathJax:

1. <math xmlns="http://www.w3.org/1998/Math/MathML">
2. <mrow data-mjx-texclass="ORD">
3. <mi mathvariant="normal">i</mi>
4. </mrow>
5. <mi>sin</mi>
6. </math>

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MathJax: $\mathrm i\sin$
MathML: $\mathrm{i}\sin$             no space

<mtext> in MathML: $\mathit{\text{i}}\text{sin}$

hbghlyj

在MathJax中,启用mmlSpacing也没见多出空白

在Chrome 109测试了, 也没多出空白.
肯定是Firefox的问题了: 已报告Bugzilla