Unable to group in tree view when results are grouped by category

[Plinsboorg]

first of all, thank you so much for the plugin. it helps a lot.
I see only one issue in my setup:
grouping to the tree view is not working with the queries where I use "Group results by" feature. for example when I group by project or by issue category.

this is how the issues grouped by category look in plain structure:

this is how grouping by category brakes when I enable tree view.

this is the setting in custom queries where issues grouping can be enabled:

Environment:
Redmine version 5.1.1.stable
Ruby version 3.2.3-p157 (2024-01-18) [x86_64-linux]
Rails version 6.1.7.6
Environment production
Database adapter PostgreSQL
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp

[Loriowar]

As you see, there is an explicit mention "Unable to group in tree view". This is limitation of the tree view plugin. You can look at the comment and related conversation to get more info about the grouping problem.