On week view with date-wise grouping, an error throw randomly while using drag and drop.
and the same error occured.
To reproduce the bug, just try to drag and drop an element sooner or later on the same day. The error occurance is kinda random but seems to always come from the same issue :
" ERROR TypeError: Cannot read property 'getFullYear' of undefined" on stackblitz and
"Cannot read property 'setHours' of undefined" directly on the page of your documentation.
I tried to track the origin of the issue with no success, but the only thing I can say so far, is that sometimes, the day value (which should be equal to the index of the day column in the view) is equal to the resource column index so => dayIndex * (n resource categories) . I don't know if my explanations are very clear. If you need more details, I can send you my logs. I doubt that this error hasn't been reported sooner, but I didn't found anything.