Well,
Few things: I tried an script that comment the line on upload and uncomment on download, works well for this error.
In other hand, your suggested fix can’t work because this line is on the header of the mdx and for some reason I can’t find it. I’m going to content > strings and search api:. This return nothing. Anyway, I have tens of files to “ignore” this line, this is lot of work to do by hand…
And finally, seem that is not the only thing that crowdin breaks! See Broken MDX components on download .