Inconsistent behavior when creating nested folders

Good afternoon,

Our clients have reported a few inconsistencies when creating nested folders which seems to be occurring only when application is running on multiple App Service instances. Please see more information regarding the issue in reproduction steps.

Reproduction information:

• ensure that site is running on multiple App Service instances (otherwise issue does not seem to occur)
• login to CMS
• create a new folder with unique name for the current site
• try creating a new folder under the one that has just been created - this now has two outcomes, none of which is expected:
  
  1. instead of new folder appearing with the name editor, the current folder gets the name editor active to change the current folder name. The new folder is created as well, with the "New folder" name.
  2. new folder appears with the name editor, however after finishing the entering of the name folder is still named "New folder". When this issue occurs, refreshing the page seems to update the folder names properly.

Installed EPiServer packages:

EPiServer.AddOns.Helpers 0.4.0.0
EPiServer.Azure 10.0.1
EPiServer.CMS 11.15.0
EPiServer.CMS.AspNet 11.15.0
EPiServer.CMS.Core 11.15.0
EPiServer.CMS.TinyMce 2.10.1
EPiServer.CMS.UI 11.24.0
EPiServer.CMS.UI.Core 11.24.0
EPiServer.CMS.UI.Sources 11.24.0
EPiServer.Forms 4.28.0
EPiServer.Forms.Core 4.28.0
EPiServer.Forms.UI 4.28.0
EPiServer.Framework 11.15.0
EPiServer.Framework.AspNet 11.15.0
EPiServer.Labs.LanguageManager 3.3.2
EPiServer.Logging.Log4Net 2.2.2
EPiServer.Packaging 3.4.0
EPiServer.Packaging.UI 3.4.0
EPiServer.Personalization.MaxMindGeolocation 1.0.0
EPiServer.ServiceLocation.StructureMap 2.0.3
EPiServer.XForms 1.0.3

Please let me know if you have any suggestions or any additional information is needed.

Best regards,
Nemanja.