I am experiencing an issue with the MB Group plugin. When using custom WYSIWYG fields in a Group, they fail to initialize correctly in the backend and show up blank in the Visual Tab. Clicking on the Code Tab, hitting refresh in the browser, and clicking on the Visual Tab resolves the issue. Also clearing browser cache solves the issue on the initial page load, but subsequent refreshes cause the WYSIWYG editors to show blank again.
Running WordPress 6.8.1, Metabox 5.10.10, & MB Group 1.4.5.
The issue does not show with WYSIWYGs outside of a Group when there isn't a Group field in use. When you add a Group field with a WYSIWYG both in-group and out-group WYSIWYGs trigger this issue.
No errors visible in debug or console. I also disabled all plugins and isolated the issue to MB Group.