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PR #21455 drew non-isolated blend-mode groups against their backdrop via a direct path on the parent canvas, but a soft mask forces the group onto an intermediate canvas instead. There the inner blend modes composited against transparency, so e.g. a /Multiply highlight was painted opaquely over the text behind it, hiding it. Copy the backdrop into that intermediate canvas so the blends see the real background. The copy is limited to groups that would otherwise have taken the direct path (source-over, alpha 1, not knockout/gray) but were displaced onto the intermediate canvas by the soft mask. It fixes #21593.