Hello,
thank you for fast response,
When I was investigating request and response I found out that when I set `campaign.url_expansion_opt_out = true` then Ruby library will add correctly update mask and it updates correctly in Google Ads.
Then when I need to set `campaign.url_expansion_opt_out = false` then Ruby library will not add correctly update mask because url_expansion_opt_out is by default false :/ I need to add update mask by myself to operation and then it works.
So sorry for taking your time it was my mistake.
Have a nice day
Ondrej Bartas