ID 264683 - A second Keylight with an alpha input runs out of memory

Problem summary
A second keylight with an alpha input runs out of memory

Customer reported version
nuke.10.5v1

Customer reported platform
10.11

Steps to reproduce

1) Open Nuke

2) Create a CheckerBoard node

3) Attach two KeyLight nodes in series

4) Create a Rectangle node and connect it to the second Keylight node's InM or OutM inputs, the Rectangle node runs out of memory

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Reproduced by support
This problem has been reproduced on:
Nuke 10.5v2 - Windows 10
Nuke 10.5v1 - Windows 10 - CentOS 7 - MacOSX 10.12
Nuke 10.0v5 - Windows 10 - CentOS 7 - MacOSX 10.12
Nuke 10.0v1 - Windows 10
Nuke 9.0v9 - Windows 10
Nuke 8.0v6 - Windows 10

Expected behaviour
For the Keylight node to use the alpha input

Actual behaviour
The input node runs out of memory, returning the error: Out of Memory!