Photoshop CC 2019: Masks not applying to smart filters

Please update to 20.0.2 which was released late last night. It should fix this issue.

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The work around is to go to Preferences > Performance... and check "Legacy Compositing"

This reply was created from a merged topic originally titled Mask of Smartfilter embedded in SmartObject doesnt Work in 20.0.1.

I've got a SmartObject. I edit its content which is another SmartObject. There I do some adjustments with SmartFilters and edit the mask. Save.
Back in the main document, after PS auto-refreshing the SmartObject's content, my adjustments are visible all over. The mask doesn't do it's job.
Still works as it should in the previous PS CC version

This reply was created from a merged topic originally titled Linked Smart Object's mask on Smart Filter is ignored in parent Photoshop documen....

In existing Photoshop versions, if you include a linked smart object, that layer's appearance shows whatever is the state of the smart object itself. However, in Photoshop CC 2019, version 20.0.1, this doesn't seem to be the case anymore. Instead, masks on Smart Filter are ignored in parent Photoshop document.

To replicate the issue:

1. Create a blank photoshop file
2. Insert a Linked Smart Object (.psb) from File > Placed Linked
3. Edit the Linked Smart Object
4. Apply a Smart Filter (e.g. Gaussian Blur)
5. Apply a mask to the Smart Filter
6. Go back to the parent photoshop file that you created and update the Smart Object. Notice how the Smart Filter applies to the entire image, not just the mask.

I have attached a screenshot of the issue. The Linked Smart Object is the desired outcome in the parent Photoshop File. 

This is a hugely frustrating bug. I'm a GD in marketing, and there's nothing more frustrating than placing a retouched image into my email template for slicing, only to find that the image is just SLIGHTLY soft because of the Dust & Scratches mask. Because the blur is so slight (I mean, we're just getting rid of dust ya know?), I'm actually not noticed it on occasion until the email is sent out. This is a PROBLEM that we should NOT have to worry about. The world of marketing is insane, and that's just one more step that graphic designers have to do in order to avoid mistakes. This "update" is awful. Don't even get me started on the inconsistent aspect ration Shift key debacle.

I figured out why Smart Filter Masks might not be enabled sometimes for you. If you transform a Smart Object with a Smart Filter Mask, and then undo the transform, the mask isn't applied correctly after undo. I'll have engineering take a look at that.