I found a very hard to reproduce error when resizing events. This happens also in some examples. It feels like its has something todo how fast you resize or how fast you switch between events you resize. And the according tooltip of the event. Not 100% sure.
TypeError: date.getHours is not a function. (In 'date.getHours()', 'date.getHours' is undefined)
updateDateIndicator — ClockTemplate.js:55
updateDateIndicator — EventResize.js:1136
trigger — Events.js:1337
updateHtml — Tooltip.js:874
set — Config.js:310
onMouseMove — Tooltip.js:943
handler — EventHelper.js:466
HorizontalRendering.js:85
[Error] Unhandled Promise Rejection:
TypeError: date.getTime is not a function. (In 'date.getTime()', 'date.getTime' is undefined)
(anonym Function) (schedulerpro.module.js:179456)
asyncFunctionResume
(anonym Function)
promiseReactionJobWithoutPromise
promiseReactionJob
This happens for me in Safari 16.3, Chrome 111.0.5563.64, FF 111.0