I'm having a hard time keeping my bookmarks at all after closing/re-opening a solution. But this way should be reproducable:
* Start with a .Net framework 4x project.
* Set some numbered bookmarks.
* Upgrade the project to 4.8
* poof!
Bookmarks – Bookmarks are not saved after changing the project properties
Answers approved by DevExpress Support
We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.
Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.
Thank you for the detailed steps, I have reproduced the problem on my side.
We will try to fix the problem as soon as possible, and will notify you about our progress in the context of this ticket.