Youth Activity Prayers

In our ward the Aaronic Priesthood and Young Women have stopped ending their meetings with a prayer. It has been said that this is new instruction and I fear that perhaps something was lost in translation. The only information I can find on the topic is the General Handbook 29:5 where it states, "Men and women may offer both opening and closing prayers in Church meetings."

Any further information or instruction on this principle?

Handbook 20.6.16:

"Prayers at Activities
All activities should be opened and, when appropriate, closed with prayer."

Which leaves the question of when is it not appropriate.

Thank you for your help.