もし、私のところ以外でも、同様の状態になっているなら、エラーレポートに、この内容を付け加える事で、原因究明に役立つ可能性があるのでしょうか?
HW_BOOT_DATA にどのような情報が書き込まれているかは分かりませんが、内容を書き出してみたところ、問題発生の有無に関わらず起動毎に値が変わっているようです。
確認
nvram HW_BOOT_DATA
結果: 問題なし
HW_BOOT_DATA %01%00%00%00%01%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%14%01%00%00%14%05%08%02%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00
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
結果: 問題あり (Safari を起動後にマシンをコールドスタート)
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
結果: 問題なし
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
HW_BOOT_DATA %01%00%00%00%07%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%14%01%00%00%14%05%08%02%00%00%00%00%00%00%00%00%00%00%00%00%15%01%00%00%07%06%08%02%00%00%00%00%00%00%00%00%00%00%00%00%16%01%00%00Y%07%08%02%00%00%00%00%00%00%00%00%00%00%00%00%17%01%00%00(%10%08%02%00%00%00%00%00%00%00%00%00%00%00%00%18%01%00%00(%12%08%02%00%00%00%00%00%00%00%00%00%00%00%00%19%01%00%004%14%08%02%00%00%00%00%00%00%00%00%00%00%00%00%1a%01%00%00%06%17%08%02%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00%00
終了時の問題なのか起動時の問題なのかは私も気になってるのですが正直分かりません...。というか、完全にお手上げ状態です。
次のアップデートで治らなかったら4Kディスプレイを購入して、Catalina にアップグレードするしかないのかなと思い始めてます。