Error when trying to group tasks

I am reposting this here since it was lost in the older master bug thread.

Version 12.0.3

I am unable to assign a task to a parent task. No amount of refreshing fixing this.

Error: Document has been modified after you have opened it (2019-07-31 09:26:30.005709, 2019-07-31 09:26:30.018997). Please refresh to get the latest document.

Steps to recreate:
Create project - add task to project with “is group” checked - add additional task to project and select the parent task. Same error every time on multiple installs.

Also, was the Task table intentionally removed from the Project page and if so what was the reasoning. This make Project creation significantly more time consuming.

Yes that seems to be the case Project and task table Bug - #3 by antiquark100

This has resolved itself with an update.