"Error Renaming File or Folder" while saving

### Expected behavior

No error happens.

### Actual behavior

In the save dialog, when selecting the folder to save, by doubleclick, this dialog is shown:

-------------------------
Error Renaming File or Folder

Cannot rename fZOO: A file with the name you specified already exists. Specify a different file name.

OK
--------------------------

There is folder named fZOO (name changed for this report from the real name, it begins with a lowercase letter followed by 3 upper case, all basic ASCII) in the same parent folder as the folder I want to save in.

Actually there are two such dialogs, one covering the other. The upper is a modal dialog to the second (if I move the upper away and click on the second, the first will blink). Actually there are more of them, like 5 (didn't count). I noticed the others after I clicked OK on the first two.

### Steps to reproduce the problem

Start JMeter 5.5

Create new plan from template

Change name and comment for the Plan object

ctr+s to save

### JMeter Version

5.5

### Java Version

Oracle 11.0.13

### OS Version

Microsoft Windows 10 Pro [Version 10.0.19044.2251]