ID 547012 - Using _Inverse to invert a LocatorType="Matrix" Node Property on a custom node's GLSL makes Mari ignore $AttributeName

Problem summary
Using _Inverse to invert a LocatorType="Matrix" Node Property on a custom node's GLSL makes Mari ignore $AttributeName if there is only $AttributeName_Inverse in the shader code.

Customer reported version
Mari 6.0v2

Customer reported platform
Multiple

Steps to reproduce
1. Create a custom node with a LocatorList Node Property, of the type Matrix, by saving the following text as LocatorListInvertedMatrix.xml into the user Scripts folder:

<Node>  <DefaultName>Locator List Inverted Matrix</DefaultName>  <Cost>0.2</Cost>  <CostDescription>Calculations</CostDescription>  <ID>LOCATOR_LIST_INVERTED_MATRIX</ID>  <Inputs>    <Input Name="Position"/>  </Inputs>  <Attributes>    <Attribute Name="Transform" PrettyName="Transform" Group="" Type="LocatorList" LocatorType="Matrix"></Attribute>  </Attributes>  <Contexts>    <Context Type="NodeGraphView">    </Context>    <Context Type="GLSL">      <Shader>        <Inputs>          <Input Name="Position"><Default>vec4(State.Position,1.0)</Default></Input>        </Inputs>        <Body><![CDATA[            Output.rgb = ($Transform_Inverse * #Position).xyz;            Output.a = 1.0;        ]]></Body>      </Shader>    </Context>  </Contexts></Node>

2. Open Mari.

3. Open a Project, such as the Example Project.

4. Import the custom node into the current Mari session by running the following in the Python Console:

import mari mari.gl_render.registerCustomProceduralLayerFromXMLFile("Locator List Inverted Matrix", mari.resources.path(mari.resources.USER_SCRIPTS) + "/LocatorListInvertedMatrix.xml")

5. Press TAB in the Node Graph and search for "Locator List Inverted Matrix" in order to find and create the custom node.

6. Double-click the created node to open its node properties.

Expected behaviour
The Node Properties would include a LocatorList property that gives inverted results.

Actual behaviour
There are no Node Properties.

Workaround
In order for this setup to work, the $AttributeName, which in this case is $Transform, must be referenced on its own in the shader, that is without _Inverse.
That can be done by adding a comment:

Add a new line between line 20 and 21.
Write the following into it:
// $Transform
Reload the custom node by selecting Tools > Shader Console > Add

Reproduced by support
This bug has been reproduced in:
Mari 6.0v2 - Windows 10 - CentOS 7
Mari 4.6v1 - Windows 10 - CentOS 7

Earliest version tested
Mari 4.6v1 - This feature did not exist before this version

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