To summarize this issue:
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It doesn’t actually work in 5.1, it only worked because of incorrect settings (?)
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I have it set RHI to DirectX12 + Nanite enabled + Custom Stencils, and I can’t get it to work on the latest official 5.1 release (as @Razdraz/@LucenDev also mentions)
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It seems like that issue mentioned earlier is related to text outlines in the UI since it is filed under [UE - Editor - UI Systems] and the commits affect Slate related code
So we need a bug report on this, I think!
I can’t seem to find another issue on the Bug Tracker. I will try to submit a new one later today.
Update 1: I submitted a bug report just now.
Update 2: Nevermind, I browsed the docs just now to double-check and it’s been there all along – it clearly says that it isn’t supported:
Update 3: FWIW, Epic created a bug report for it here: Unreal Engine Issues and Bug Tracker (UE-171655)