[SERIOUS BUG] UI glitch is corrupting my project

Ran_TH

Live2D Cubism Editor UI glitch almost had me losing my project today.
I was reordering some parts in Parts palette tree and suddenly the UI glitched, the Part that I dragged on mouse release is gone and when I try to undo the canvas view is gone. I saved the project in that state, now turns out the project I saved can't be opened anymore.

Luckily I have backups since I have plenty of experiences with Live2D corrupting projects, just want to let you know that this situation still happens.

I will DM the project and logs when requested, for now here's the error I tried to open the corrupted project:

[ERROR] java.lang.StackOverflowError
[ERROR] 	at com.live2d.cubism.doc.model.CModelSource.getObject$default(Unknown Source)
[ERROR] 	at com.live2d.cubism.doc.model.parts.CPartSource.getChildren(Unknown Source)
[ERROR] 	at com.live2d.cubism.doc.model.T.a(Unknown Source)
[ERROR] 	at com.live2d.cubism.doc.model.T.a(Unknown Source)
[ERROR] 	at com.live2d.cubism.doc.model.T.a(Unknown Source)
[ERROR] 	at com.live2d.cubism.doc.model.T.a(Unknown Source)
...........

For the record I'm using Live2D Cubism v4.1.05.

kudo(Staff)

Hi, @Ran_TH
Thank you for your contact.
We apologize for any inconvenience this may cause.

We are working on a reproduction study.
Could you provide a model and logs?
If possible please provide a screen recording to confirm the problem.

Please fill in all the information below:
Live2D Software Version: (e.g. Cubism Editor 4.1.00 beta1)
OS & Version: (e.g. Windows 10, macOS HighSierra)
PC Model: (e.g. MacBookPro 2017)
Video card: (e.g. GeForce GTX 950M)
CPU: (e.g. Intel Core i7-7700)
Memory(RAM): (e.g. 8GB)
Illustration Software used: (e.g. Photoshop, ClipStudio, SAI)

If you don't want the data to be public, please send it via DM.
[How to send a direct message]
Click on my name, "kudo(Staff)".
My profile screen will open. Click on [Message] in the top right corner.
The message sending screen opens.
Click on the icon [Attach file] and select the file.
Click [Post Message] to send the message.
(Please compress the file. If the file is too large to be attached, use an upload site or similar)

We appreciate your cooperation.
Thank you.

kudo(Staff)

Hello, @Ran_TH
Thank you for the files.

We will investigate the cause of the problem with the developer using the files you provided and will try to improve the problem.

Thank you very much!