ID 233437 - Sharing a layer between two channels breaks the Overlay blending mode's behaviour

Problem summary
If sharing a layer between two channels the 'shared' layer does not get treated in it's source colorspace breaking operations such as "Overlay" blending mode.

Customer reported version

3.1v2

Customer reported platform
10.10

Steps to reproduce

1) Create two 8-bit sRGB channels

2) Create two 16-bit Linear Channels

3) Share a layer between the two channels

4) Select the shared layer and set the layer mode to Overlay

5) Observe the image becoming lighter

Workaround

No known workaround

Reproduced by support
3.1v1, 3.1v2, 3.1v3

Expected behaviour
For the colour not to change