Does this happen with SW-WR as well? If so, then bug 1479135 and bug 1710855 are likely related and we likely need to adapt https://searchfox.org/mozilla-central/source/widget/gtk/nsWindow.cpp#931-936 for this case.
Bug 1731125 Comment 3 Edit History
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Does this happen with SW-WR as well? If not, then bug 1479135 and bug 1710855 are likely related and we likely need to adapt https://searchfox.org/mozilla-central/source/widget/gtk/nsWindow.cpp#931-936 for this case.