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The launch on Friday used the old fins. During re-entry, one set was glowing from the heat. I really thought it was going to cause a landing failure.

They have always done that. Up until this launch the grid fins were coated with an ablative material that was designed to burn off.

That was just the paint burning off, I think.

Yeah, it's normal for the aluminum + ablative paint version to look Really Alarming during a hot landing.