Eevee AOV passes have inacurate colour and semi-transparent alpha channels that are set to 0.9844 instead of 1 #85261

System Information
Operating system: macOS 11.1 / Windows 10
Graphics card: AMD Radeon Pro 5500M 4 GB / GTX 1050ti

Blender Version
Broken: Blender 2.92.0 Beta, February 01, 00:13:03- a9b53daf23
Worked: NA

Short description of error

Eevee's AOV passes do not seem to deliver accurate colour or alpha channels when compared to (what should be) equal output from the combined channel. Alpha channels seem to specifically be limited to 0.9844 where they should be 1.

Material setup

Viewing the render of the combined pass (note alpha channel value of 1 at the bottom of the viewer)

Viewing the render of the cube pass (note alpha channel value of 0.9844 at the bottom of the viewer)

This has also been noted by this StackExchange user using a ColorRamp instead of an emission shader, this can be replicated with EXRs output from Blender and read into Nuke.

Exact steps for others to reproduce the error

Create a new emissive material in Eevee and apply it to an object
Use a Shader to RGB node to convert to colour data and attach to the new AOV Output node for Eevee
Configure render settings to output as EXR with the "Standard" (linear sRGB) viewer transform
Configure render passes to render out the newly created AOV in the View Layer Properties panel
Render!
Check the values

Blend file is attached! Eevee AOV problem.blend

Added subscriber: @Shrinks99

Added subscriber: @Jeroen-Bakker

Looks like a missing sample count. (eg divide by 65 samples in stead of 64).

Added subscriber: @lichtwerk

Changed status from 'Needs Triage' to: 'Confirmed'

Guess this should be High prio.

Fix incoming.

This issue was referenced by 85fe12071a

Added subscriber: @geocentric_wage

Changed status from 'Confirmed' to: 'Resolved'

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Eevee AOV passes have inacurate colour and semi-transparent alpha channels that are set to 0.9844 instead of 1 #85261