Keep existing entry fields

Editor assessment

The subject states the fix's intent precisely: existing entry fields in Contentful are now preserved, implying a sync that previously wiped or overwrote them. The protective behaviour is clear without a diff. Fix is right; the contentful-plugin scope names the area even if it reverses the package's house naming. No body documents the data-loss scenario, the one fact that would elevate this, but the headline is complete and honest. Clean imperative phrasing. A publishable small-fix message.