ID 371562 - Floating R UI buttons

Problem summary
Floating reset UI buttons are appearing under Node Properties when importing a custom node from XML file

Customer reported version
4.2v1

Customer reported platform
multiple

Steps to reproduce

1) Open Mari and an example project

2) In the Python Console register the attached custom node from the XML file

3) In the Node Graph create the custom node

4) Go to Node Properties>Interactive Placement

5) Floating R buttons are appearing 

Workaround
Unknown

Reproduced by support
This bug has been reproduced in:
Mari 4.2v1 - Windows 10 - CentOS 7
Mari 4.1v1 - Windows 10 - CentOS 7 - regression
Mari 4.0v1 - Windows 10 

Unable to reproduce bug in:
Mari 4.1v1

Earliest version tested
Mari 4.1v1 - This issue no longer appears in this version and has regressed

Expected behaviour
The R buttons to be situated on the right side in the Node Properties

Actual behaviour
The R buttons are floating on the left side in the Node Properties

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