deformed rose bud with golden liquid

I've noticed a deformed bud / unfurled leaves on my rose bush that almost looks like it has pustules. Dripping from it is a golden liquid, although it's been days since I first noticed and the drops haven't fallen so they must be gel-like. I assume there's something living in there.
Does anyone know what it could be?

Does anyone know what it could be?

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"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog