Re-adding a multivalue item that was just removed will populate with the default example value [#3587472]

To reproduce:

you need a multivalue field (lets do string, but it's not specific to string) with at least 2 example values
add the component to the layout
(needed to reproduce, though I'm unsure why) make a change to item 1
(optional, but helpful for knowing this is the default value, not a stale form entry) make a change to item 2
remove item 2
Click "add new"

The newly added field is not empty, but has the example value.

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3587472-re-adding-a-multivalue changes, plain diff MR !1017
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