The new /execute command does not work in addon codes

For some reason since the update that changed the /execute command it stopped working in addon codes, it doesn't work in mcfunction files and it doesn't work in block either

An example of the command not working in the mcfunction file:

 

execute as @a run tellraw @a {"rawtext":[

{"text":"Olá, mundo!"}

]}

 

I hope you can help me