Color Changing Platform still collides when invisible

I followed the doc here:

I have set the platform to have collision enabled “Only When Visible”, but it doesn’t work.
The platform disappears as expected, but the player doesn’t fall when the platform has disappeared if they are stood on it at the time.

Did I miss something. Pretty sure I didn’t, but maybe…
Is this a bug?

Cheers!

This still isn’t working as described in the documentation.
The collision is either Off (No collision ever) or On (always has collision), but never off when invisible and on when visible, as this setting is supposed to be able to implement.

Cheers,
Rob