After the last update, I can no longer mount folders on the encfs.
show the error:

encfs /mnt/arquivos/d /mnt/arquivos/data
encfs: error while loading shared libraries: libtinyxml2.so.5: cannot open shared object file: No such file or directory

The only thing you have in the log that can indicate what happened was the upgrade from tinyxml2 5.0.0-1 to tinyxml2 6.2.0-1

Any tips on what might have happened?

Thanks

Yep, bug in packaging.....
It should have been rebuild on new tinyxml2, will be done shortly.
You can always open bug reports too for cases like this.
https://kaosx.us/docs/bugs/

EDIT:
Actually encfs is already build on new tinxml2 (5 days ago), just didn't move with it correctly, get it now from the build repo:

sudo pacman -U http://kaosx.tk/repo/build/encfs-1.9.5-1-x86_64.pkg.tar.xz