Hello!
Our team found an issue in the scheduler when overlaps are not enabled: users can paste the events multiple times leading to overlaps. Reproduced with the allowOverlap flag set to false in the following demo: https://bryntum.com/products/scheduler/examples/vertical/
It can also be reproduced in horizontal mode.
Unfortunately, I don't have a proposal for how this should be handled.
Thanks in advance for checking it out