ID 378934 - The first layer in a 16/32 bit channel has the Colorspace Enabled feature set to Enable but every successive layer has this option set to Disable

Problem summary
The first layer in a 16/32 bit channel has the Colorspace Enabled set to Enable but every successive layer has this option set to Disable.

With 8 bit Channels, the Colorspace Enabled feature is set to Enabled in every layer as expected

When creating 16/32 bit Quick Channel, every layer is set to Disabled

Customer reported version
4.2v2

Customer reported platform
n/a

Steps to reproduce

1) Open Mari and load an example project

2) Create a new Channel form the Channels Palette>Add Channel with either 16 or 32 bit depth

3) Go to the Layers Palette, select the Base layer and open the Advanced Blending Options 

4) Notice that the Colorspace Enabled is set to Enable

5) Add a new Layer and check the Colorspace Enabled in the Advanced Blending Options once more for the new Layer

Result: every successive layer is set to Disable

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Workaround
8bit channels work as expected 

Reproduced by support
This bug has been reproduced in:
Mari 4.2v2 - Windows 10 - CentOS 7 
Mari 4.0v1 - Windows 10 
Mari 3.3v1 - Windows 10
Mari 3.2v1 - Windows 10
Mari 3.1v3 - Windows 10 - CentOS 7 - OSX 10.12.6

Earliest version tested
3.1v3 - This feature did not exist before this version

Expected behaviour
Every layer to have the same settings for the Colorspace Enabled feature regardless of the Channel bit depth

Actual behaviour
The first layer is set to Enable and every layer after that is set to Disable