[svg] Munderover not rendered correctly

Created by: RainHallikas

Using MathJax 3 MML-SVG and munderover gets rendered incorrectly. MathJax 2.7.6 does not have the same issue. It's because the mstyle has mathsize of 140%. Result link: https://i.ibb.co/hDp5d9P/Capture.png and source MathML:

<math xmlns="http://www.w3.org/1998/Math/MathML" id="mml_m11" overflow="scroll"><mrow> <mi>T</mi> <mi>E</mi> <msub> <mi>R</mi> <mrow> <mi>H</mi> <mi>F</mi> </mrow> </msub> <mo>=</mo> <munderover> <mstyle mathsize="140%" displaystyle="true" stretchy="false"> <mo>∑</mo> </mstyle> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <mi>E</mi> <msub> <mi>R</mi> <mrow> <mi>A</mi> <mi>L</mi> <mo>,</mo> <mi>H</mi> <mi>F</mi> <mo>,</mo> <mi>n</mi> </mrow> </msub> <mo>+</mo> <munderover> <mstyle mathsize="140%" displaystyle="true" stretchy="false"> <mo>∑</mo> </mstyle> <mrow> <mi>m</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>M</mi> </munderover> <mi>E</mi> <msub> <mi>R</mi> <mrow> <mi>E</mi> <mi>L</mi> <mi>V</mi> <mo>,</mo> <mi>H</mi> <mi>F</mi> <mo>,</mo> <mi>m</mi> </mrow> </msub></mrow></math>