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Plunkr Case (Bug Reports)
https://stackblitz.com/edit/primeng-calendar-demo-nrnhmx?file=src%2Fapp%2Fapp.component.ts

Current behavior
Currently if you set the calendar component with view="month" and selectionMode="range" the selected range is not been highlighted.
Also, if you set up the property maxDate, the corresponding dates (in this case months) are not being disabled.

Expected behavior
The selected month range should be highlighted.
Months after maxDate should be disabled.

Minimal reproduction of the problem with instructions
Using the example provided, select a range of months.
Notice that even with maxDate set to February, months after that are not being disabled

What is the motivation / use case for changing the behavior?
The user needs to see the range he/she selected
I need to be able to show the user that future dates (months) are not avaible to select

Please tell us about your environment:

• Angular version: 5.X

• PrimeNG version: 5.X

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
  Operating system: Windows 10 Enterprise
  IDE: VSCode
  Package manager: npm, node

Angular version:
13.2.1

PrimeNG version:
13.1.0

Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
Chrome 89.0.4389.128

Language: [all | TypeScript X.X | ES6/7 | ES5]
TypeScript 4.1.2

Node (for AoT issues): node --version =
v14.15.1