[Bug Report][2.4.11] Inconsistent behaviour of 'x more' in v-calendar month view when switching or filtering large data-sets

[vandrongelen]

Environment

Vuetify Version: 2.4.11
Vue Version: 2.6.11
Browsers: Chrome 90.0.4430.212
OS: Mac OS 10.15.7

Steps to reproduce

1. In mounted function load this.events = this.dataset1. After saving the page is loaded perfectly.
2. In mounted function load this.events = this.dataset2. After saving the page is loaded perfectly too.
3. In mounted function load this.events = this.dataset1. After saving click the 'switch dataset' button. Strange behaviour appears on the 12th of May.

Expected Behavior

Consistency on how 'x more' is displayed and consistency in the amount of events that are displayed before 'x more' is displayed.

Actual Behavior

When initial data-set is loaded there is nothing wrong. The strange behaviour of 'x more' happens when switching from one data-set to another data-set.

Reproduction Link

https://codepen.io/keesvandrongelen/pen/dyvRXyd

Other comments

Might be related to issue #12767

[jacekkarczmarczyk]

#12767 is not fixed by the PR so might be a different bug