I'm some trouble with new version of Metabase v.0.42.0, before updated I was running v0.39.5.
1- Question saved before update with correctly filters sintaxe, after update, we noticed some filters troubleshot and by that, the question don't enable run buttom the temporary solution was erase any '}' filter and put again.
2- error 'input name_of_filter', but the question and filter was okay, the temporary solution was change the Variable type for any else and returt the correctly type.
3- Don't respect commented filters. Ex: --{{filter}}
The version .42 expect an input and show in the front end.
Ex topic 3: