Fix hydration with empty spread attributes #4647
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jkelleyrtp
approved these changes
Oct 4, 2025
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When we switched from having a single attribute per mount slot to many per mount slot, the hydration logic wasn't changed. We currently only hydrate nodes that have any real attributes attached to them which causes issues with empty spread attributes. They have a slot we need to keep track of where attributes could be inserted in the future, but don't have any attributes today. This PR fixes that issue and adds a regression test
After this, #4640, and #4600 the component library works out of the box with hydration
Fixes #4646