Lawyer have an obligation to keep their mouths shut. When your lawyer contacts a accountant normally this also applies to them in that process. Besides you select you lawyer based on his/her expertese.
Besides, tax reduction is only one issue they take care︀ off, the other is getting advice in 'minimising UBO disclosure requirements'. The nice thing is︁ that most of it is fully legal, so it makes you sleep very well as︂ well.