right click on bookmark folder tree to add folder doesn't always add folder

[LaurenWags]

Test plan

1. Clean profile
2. Open Bookmark Manager.
3. Add a sub-folder under Bookmarks Toolbar.
4. Add a bookmark to this sub-folder (any method)
5. Right click on the sub-folder and select 'Add Folder'
6. Fill out information and select Done. Folder should be added

Description

In the Bookmark Manager, if you right click on a Folder to add a sub folder, the folder isn't always added.

Steps to Reproduce

1. Clean profile 0.20.14
2. Open Bookmark Manager.
3. Add a sub-folder under Bookmarks Toolbar.
4. Add a bookmark to this sub-folder (any method)
5. Right click on the sub-folder and select 'Add Folder'
6. Fill out information and select Done. Folder is not added.
7. Try to add folder another way (i.e. icon in folder tree list pane). Folder is added.

Actual result:
Folder is not added in step 6 when right click -> Add Folder:

Expected result:
Folder should be added as it was in 0.19.123:

Reproduces how often:
Easily

Brave Version

about:brave info:
Brave | 0.20.14
V8 | 6.3.292.48
rev | 5d75826
Muon | 4.5.33

Reproducible on current live release:
No

Additional Information

Similar to #12477