PPro masking has GONE!
Am I being thick or has PPro, since the introduction of the whole AI-powered roto/"Unassigned Masks"(?!) thing lost its ability to do simple masking?
Until recently, to mask out a portion of a clip, I'd open the clip's Opacity in the Effect Controls panel, click the pen icon and draw a mask. That's it.
But that's now gone, and it seems every reference I can find to masking now only refers to masking an effect. And there's the new AI mask/rotoscoping thing, which I'm not interested in this project. How can I simply add a mask to a layer - I just want a portion of it to show; the mask will not move, and I have no effects on the layer - it's effectively like a garbage matte. Am I missing something?
This is from Adobe's help page (https://helpx.adobe.com/premiere/desktop/add-video-effects/create-masks-and-composites/create-masks-using-shapes.html😞

...in reality, the maksing tools have gone:

...and if I select the pen or rectangle tools from the tool panel, if I also have a clip selected in the sequence (because I want to draw a simple mask on it), clicking in the Program or Source panels does absolutely nothing. If I deselect the clip, I can draw vector shapes with those tools (which is not what I want).
What on earth is going on here?!
PPro Beta 25.6.0x78
Windows 10
Update: I have now deactivated the "New Masking" beta feature, converted my project to version 43, and loaded it up again. Phew - the masking controls have made a welcome return! Let's hope (I did not use any of the new masking features) PPro hasn't put anything anywhere in my project that will break things down the line!
