iCal - google calendar no SMS or Message with sound

Hello,

few weeks ago I found that I could not add "Message with sound" alert to my iCal's Google calendar which brings me to no SMS alerts.

Is it anything wrong with my iCal, Google calendars (I can add Message with sound to iCloud calendars) or it is something Apple/Google recently changed?

If I add Message with sound alert using iCal - it automatically disappears. However, if I add SMS alert on Google side I have SMS alerts even if it does not reflect anyhow on the corresponding iCal entry.