V9: Saving document types generates new property group unique keys on each save.

[AndyButland]

Which exact Umbraco version are you using? For example: 8.13.1 - don't just write v8

Latest v9/dev

Bug summary

When saving a document type, the property groups are getting new unique Ids generated each time.

Specifics

No response

Steps to reproduce

• Create a document type with a property group and save.
• Find the Id of the new document type from the querystring and query the following in the database

select * from cmsPropertyTypeGroup where contenttypenodeid = <id>

• Observe the uniqueId field.
• Make a change and save the document type.
• Note that the uniqueId field has changed.

Expected result / actual result

The unique Id should not change.

Have confirmed on a V8 site - recent, but not the latest - that it doesn't,

[bergmania]

I can confirm it is also a problem in v8.17