Gaussian Blur only applies to the first mask when multiple masks are created

When I apply the Gaussian Blur effect and create multiple masks, the blur is applied only to the first mask. The other masks do not show any blur effect.

Steps to reproduce:

1. Add a clip to the timeline.

2. Apply the Gaussian Blur effect.

3. Create a mask under the Gaussian Blur effect.

4. Create one or more additional masks under the same effect.

5. Adjust the blur amount.

Expected result:

Gaussian Blur should be applied to every mask created under the effect.

Actual result:

Gaussian Blur is applied only to the first mask. The additional masks have no blur applied.

Premiere version: 27.0(Beta)
Operating system: MacOS Tahoe