Thanks for that, this does clear the resource selections, but not the scheduler selected cell. IN your above example it must not have the scheduleContextFeature set to true, so we don't see the scheduler selected cell.
A also wanted to clear this. Is there a way to also do this?
I tried to disable the feature in runtime. But that looks like it's not working properly, so I opened a Github issue for that to fix. Here it is https://github.com/bryntum/support/issues/6109