Problem with tml3drenderer after upgrade of Vuforia Studio

[LS_9776545]

Good morning everyone, I am experiencing a big problem with my publications after upgrading Vuforia Studio to version 9.2.2 (9.2.2.5162).
Specifically, I use the following functions: 

tml3dRenderer.setProperties(group_selection[i], {opacity : 0}) and tml3dRenderer.setProperties(group_selection[i], {hidden : false})

to hide/show parts or entire groups of pvz models

The second function with the parameter "hidden: false" is not working anymore.

The project is large and the client using the experience is not really satisfied with this malfunction.

Can someone help me?

[SteveGhee · Accepted solution]

there is a known problem (recently identified elsewhere) here where hidden:false is not working

hidden:"false" will work

obviously this is not to spec of the API so it will hopefully be fixed asap.

if you ned to move forwards quickly, use the string form i.e. hidden:"false"

should also note this only appears to affect anything in preview.  

for actual devices, the API is working correctly