Play In Editor Screen Position Error

Development Rendering
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1

If I make a simple post process material using screen position or texcoord and scene texture,

130941-material.png
130941-material.png760×489 62.6 KB

it will show correctly when first opening the project, but the UVs don’t work right if you have opened the material editor.
Tested on 4.15 and 4.12.5 on different projects. Similar results.

Play standalone game works, so it isn’t a huge problem, but it would be nice to have live updates.
Does anyone know a way around this? Is this a bug, or am I just doing something weird, which I tend to do?

Correct:

130942-good.jpg
130942-good.jpg1302×761 98 KB

Wrong:

130943-bad.png
130943-bad.png1069×559 421 KB

2

Hello ZafoTheGreat,

Yes the viewport does not update in the editor but everything works in standalone I lost a lot of time to understand what was happening. A little update in the PP documentation would be welcome to warn that when we modify the UV that can’t be seen in the editor.

I’m not sure whether this is a bug or not I think more that’s a limitation of the engine.
I found someone else having the same problem here.