Never heard of it before, sorry...I could tell you a Rungus Myth In my Hometown... (The Tip Of Borneo a.k.a Kudat)
I'm a Rungus person and Rungus is 1 of the 32 tribes in the Sabahan Land...
Rungus has a special name for Mantids and is called 'Bozon' and in Murut language is 'Boyot'
And why the Rungus people called the Mantis 'Bozon', here is the reason...
According to the Rungus myths, When harvesting season arrived, people will harvest the paddy fields and will likely to fine many Mantids on the the very top of the Paddy plants.If there are many Mantis on the top of the Paddy plants, It will be a fine and sunny day to harvest the paddy plants.But if they find many Mantids hiding under the paddy plants and less Mantids go out, it will be a Rainy day for harvesting...
I do believe this myth...