I have verified this issue on the Firefox Beta 71.0b8 (Build ID: 20190919164641) (64-bit) on Windows 10, MacOS 10.14 and Ubuntu 18.04 x64. - The field-label margin-bottom is increased to 8px and the fields are properly displayed.
Bug 1579262 Comment 6 Edit History
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I have verified this issue on the Firefox Beta 70.0b8 (Build ID: 20190919164641) (64-bit) on Windows 10, MacOS 10.14 and Ubuntu 18.04 x64. - The field-label margin-bottom is increased to 8px and the fields are properly displayed.