Baking Selected to Active is broken in 2.90 #78072

System Information
Operating system: Linux-4.15.0-101-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-20 04:49, hash: d994391e0c
Worked: 2.83

Short description of error
Baking two(or more?) objects to the active doesn't produce correct results in Blender 2.90.

The attached test scenes, each consisting of 2 objects and a plane, properly bake to this result in 2.83:

In 2.90 however, it bakes to either this

or this

I'm not even sure what the difference between the two blends is. One is the orignal blend where the issue was discovered, the other is the 3 objects copied to my startup file.

bake_active_to_selected.zip

Exact steps for others to reproduce the error

extract the zip file and open either bake_selected_to_active.blend or bake_selected_to_active2.blend in Blender 2.83 and bake
repeat for Blender 2.90

Added subscriber: @MACHIN3

Added subscriber: @dupoxy

This may be related to #77298: Can't bake texture with multiple objects.

It does!

Added subscriber: @Varzov

Tested and reproduced on Win 10 64 Version 1903(OS Build 18362.900)
Blender version 2.90.0-874af5301cdf

Added subscriber: @Ariel-Tavori

Added subscriber: @NXGEN

Tested and reproduced on Windows 10 Version 2004 (OS Build 19041.329)
NVIDIA GeForce GTX 1080 Ti - Drivers 446.14

Blender version 2.90.0-a7f1c68938f9-windows64
bake_selected_to_active.blend

bake_selected_to_active2.blend

From my usual default startup file, manually appended the meshes and recreated the bake setup. Same result as with the provided files:
bake_selected_to_active.blend

Blender version 2.83.0-windows64
bake_selected_to_active.blend

bake_selected_to_active2.blend

Added subscriber: @bigbadcat3d

Confirming...

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

Added subscriber: @iss

I forgot to check #77298 prior to confirming. Seems like identical report, but has bad commit, so I will close this as duplicate.

Closed as duplicate of #77298

Changed status from 'Duplicate' to: 'Resolved'

Added subscriber: @LukasStockner

@LukasStockner @iss

This bug is not in fact fixed in 2.90 yet. It was marked as a duplicate of #77298 which seems to be fixed, but its only baking diffuse. Normal baking is still broken, you can check the sample file here or set the baker to Normal in #77298

Please re-open or fix.

edit: AO seems to be also broken.
edit2: Something funny is going on: Setting the Render Samples to 1, will bake Normal and AO properly. AO looks pretty bad of course.
edit3: Samples above 1 will increasingly "dial up" the transparency of the Normal in some areas, until it appears fully transparent as in the example images above.

Added subscriber: @Carlosan

Confirmed

Added subscriber: @datadieb

Confirmed

Added subscribers: @brecht, @lichtwerk

Changed status from 'Resolved' to: 'Confirmed'

This is indeed not fixed.

CC @LukasStockner
CC @brecht

Reopened #77298 (Can't bake texture with multiple objects.) now, so will merge this back in...

Closed as duplicate of #77298

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Baking Selected to Active is broken in 2.90 #78072