I have Polylang 0.8.3 installed and everything works great, except that when I edit an post and add tags, the tags disappear when I save the post.
The tags table shows that the tags have been added to the database, but they lack any language. As they don't have any language, Polylang seems to hide them.
I can fix this by manually running manually in database:
insert into wp_termmeta set term_id=219, meta_key="_language", meta_value=48;
However this is still a bug and should work without the need to run SQL manually.