So, there was another update to Dynamic Components. I can’t find any release notes about it. This happens occasionally and there are never any release notes about what has changed. Does anyone know how to find this info? Thanks!
According to Extension Warehouse
Dynamic-components RELEASE NOTES
*Upgraded for SketchUp 2021
They are pretty tight-lipped, though… as usual. 
Oh, I asked because I’m using 2020. Thought there were improvements. Should have known better. Thanks!
I expect the only changes were to get the extension to follow the current Ruby API.
Thanks for the info.