Obsidian 1.13.x updated MathJax, consequently LaTeX Suit plugin was updated to 1.13.4. This broke Excalidraw Extras. Now fixed.
Thanks to @Max_Steger for flagging the issue persistently… unfortunately I was lost in K-Plex and was not monitoring the Extras issue log where already two issues have accumulated.
Bottom line: the issue is now fixed. Please update to 0.1.1