Handle "expose" for variant elements with all invariant properties #17621
+179
−12
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Prerequisites
If there's an existing issue for this PR then this fixes #17521
Description
See the linked issue for a description. Notice that there is a slight error in the issue description, which has been corrected in this comment.
Testing this PR
Variant elements that contain only invariant properties should be exposed correctly - that is, exposed when created in each individual language (they should not behave like invariant elements, because they are indeed variant).