inklayers VS textext

I attempted to solve the problem on my own, but unfortunately, I was unable to do so. Therefore, I am seeking for help by posting my issue here. I am currently experimenting with the 're-edit' feature of LaTeX code using textext in Inkscape. However, I am encountering difficulties as the feature does not seem to work correctly. It functions initially when I create it, but stops working if I click into it. In the attached image, I have provided a simple example of LaTeX code for both $M$ and $N$. Strangely, I am able to edit the code for $N$, but not for $M$. Hope that someone with more experience can help me resolve this problem. I came across a similar issue on the following link (https://github.com/textext/textext/issues/108), but I was still unable to find a solution. For reference, I have also attached the .svg file in case anyone would like to investigate further. This is the link to svg file: https://svgshare.com/s/toL

Thank you for the detailed help. I have successfully set it up, and the shortcut is now working properly. Regarding the re-edit, I have come across this link, which seems to address the same issue. I think I can experiment and resolve it myself. https://github.com/textext/textext/issues/108