Warning "unknown attribute <background-color>"

[hinneLinks]

Describe the Bug

Coloring the named Paths after a Gateway, saving the Model and reopen It, creates a Warning:

[ FILE_PATH ] unknown attribute <background-color> [ warning ]

Its not just the Warning, our automated Unittests using these Models fail, because of the created "background-color"-Attributes. See full atttached Stacktrace: bug-background-color-camunda-bpm-unittest.txt

* cvc-complex-type.3.2.2: Attribut 'background-color' darf nicht in Element 'bpmndi:BPMNEdge' vorkommen. | resource process/Process.bpmn | line 215 | column 170

Steps to Reproduce

1. Create a simple Model with named Paths on a Gatway (see test diagram)
2. Select every Element with STRG + A (including the Outgoing Paths of the first Gateway) and give them a Color
3. Save the File
4. Reopen the file, now the Log opens with two Warnings, both related to the outgoing Paths of the Gateway
   [ FILE_PATH ] unknown attribute <background-color> [ warning ] [ FILE_PATH ] unknown attribute <background-color> [ warning ]

Expected Behavior

No Warnings (e.g. no invalid elements) are created when saving and reopening a File with colored Elements.
Models created by Camunda-Modeler run without Parsing-Errors in Camunda-Unittest and Engine.

Environment
I tried both 4.11.1 und 4.10.0 Versions of Camunda-Modeler

• OS: Windows 10
• Camunda Modeler Version: [4.11.1, 4.10.0]
• Execution Platform: [Camunda Enterprise Platform 7.15.6]
• Installed plug-ins: [4.11.1: None, 4.10.0: BPMN Linter, Camunda Property Infos, Tooltip Plugin, Transaction Boundaries]

p.s.: If necessary/Helpful i could also create an Jira-Ticket at jira.camunda.com since we are an enterprise customer for the Engine.
pps: This Bug Might be related to #2452 but we are only using Camunda Modeler to edit our Models.

[nikku]

Thanks for your bug report. We'll have a look and get back to you soon.

[smbea]

Thank you for your contribution. I was able to reproduce the issue. We'll look into this.

[nikku]

Will be closed via bpmn-js bump.