Hello Gem_Dev
Thank you for this topic.
After asking the community around how did the use their object tags (Filter Object by Groups - #15 by Luni), we noticed that it was a feature that could be merged with the Object Folders ([CURRENTLY TESTING] Object Folders), so the object tags were removed (since it conflicts with the existent tags) from the beta version.
If you’d like to test the beta version of the Object folders through the lens of organising your objects by categories (the example that you just kindly gave us), please head to this Discord channel: GDevelop
You have up to September 29th to share your feedback. 
Thank you so much for help us improve GDevelop!