Overlapping events dayMaxEvents "more" count is sometimes off

[Chicken]

Reduced Test Case

https://codepen.io/AnttiCodes/pen/jOzNzMG

Bug Description

Sometimes with overlapping events and dayMaxEvents, the "more" count is off.
See the reduced test case for an example. Make the window size smaller to trigger the feature and the bug.
I'd expect the numbers to be 2 3 2 but they are 2 3 1.

Screenshots

Normally

Reduced window size

Even more reduced window size (for some reason fixes it?)

The event also disappears from this popup

[acerix]

Thanks, confirmed. Seems it may the same issue as in:
#6608
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[arshaw]

Fixed in v6.1.11

Updated repro:
https://codepen.io/arshaw/pen/RwdOyee