It is happening a weird bug in the article pt:Pandemia de COVID-19 no Brasil. The page was with some Lua memory erros, an user reduced then the content of the article to fix that, the user related the memory errors was sometimes appearing sometimes not, another user noted that when a template was added at the top of the page all errors was gone, that is the weird part, by adding a template that uses Lua modules the memory errors disappeared, it was expected that the more modules the more memory usage and more memory errors. A third user (@Albertoleoncio) reported the Lua memory usage before 52428767/52428800 bytes and after 42455024/52428800 bytes add the template. The discussion in Portuguese is in the article talk page (feel free to comment there in English if necessary).
Now the page can not be edited, an user reported that sometimes appear an error message and sometimes the page keeps loading forever when trying to save a new edit.