I can reproduce, when printing the testcase to the "Microsoft Print to PDF" print target. I can also reproduce when printing the testcase to an actual printer (Brother HL-2280DW). But for whatever reason, I cannot reproduce when printing to our built-in Save-to-PDF print backend. So that's sort-of a workaround, I suppose.
Bug 1962816 Comment 3 Edit History
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I can reproduce, when printing the testcase to the "Microsoft Print to PDF" print target. I can also reproduce when printing the testcase to an actual printer (Brother HL-2280DW). But for whatever reason, I cannot reproduce when printing to our built-in Save-to-PDF print backend. So that's sort-of a workaround, I suppose. (i.e. you can avoid this bug by first printing to the Save-to-PDF backend, and then printing the resulting PDF (whether from Firefox or any PDF viewer) to the print target where you really want to print)