I confirm the problem with LibO 6.1 beta 2 and with 6.2 alpha 0 (master) on Linux. The same extension works without problems on 6.0.
Ops! Considering that Leap 15.1 will be ready by the end of this month and it will come with dvisvgm 2.1.3, I'll go on with normal LaTeX and then recompile all equations using XeTeX backend. Thanks for this great improvement!
I forgot to mention: it's a clean install on a new user profile, no previous TexMath install on that system.
Error with version 46 on LibO 6.0.3 with XeLaTeX backend
Using xetex instead of pdftex?
If you have any plan to translate EqualX, I can give you a hand with Spanish... and...