Using 'hidden' scripting message for bpatcher stopped working

mooter's icon

The instruction to set a bpatcher 'hidden' on and off via thispatcher doesn't work anymore.

I'm not sure which of the previous versions this started happening but I tracked down this error message that started popping up:
"patcher - doesn't understand ""

I traced it to my js message to '    UI.getnamed('myBpatcher').message('hidden', num);
I then tried it inside the patch holding thebpatcher with a toggle going through a 'prepend script send myBpatcher hidden'
and it gives the same error message.
I have a lot of 'hidden' toggle messages going to pieces of my UI, and it's the only one giving the error.

Bug?