When 'Android Build Support' Module installed with 'Android SDK and NDK Tools' through HUB then in Editor Preferences Invalid Android NDK Directory(NDK 19.0.5232133) get detected.

Invalid Android NDK Directory -> NDK 19.0.5232133
Recommended Android NDK Directory -> NDK r21d (64-bit) 21.3.6528147

How to reproduce:
1. Open Unity Hub(2.4.1 ) > Installs > 2021.1.0a1
2. Add Modules > Android Build Support > check 'Android SDK and NDK Tools'.
3. Create new project > Switch platform to Android
4. Go to Preferences > External Tools > Android NDK version installed
5. Disable 'Use embedded NDK' and Select a folder where your NDK installed and provide that path

Actual Result:
Invalid Android NDK Directory get installed when 'Android SDK and NDK Tools' installed through HUB

Expected Result:
By Default, Recommended Android NDK Directory should install when 'Android SDK and NDK Tools' installed through HUB

Workaround:
Download and Give the path of Recommended Android NDK Directory externally
https://developer.android.com/ndk/downloads

Reproducible in:
2021.1.0a1

Working Fine on:
2020.2.0b7, 2020.1.8f1

Environment:
Occurring on Windows 10 , Mac 10.15 and Ubuntu 18.04

Note:
-Without workaround unable to build an android player, Build failed with
UnityException: Android NDK not found
-On using workaround able to make android build with 'Mono' Scripting Backend but it failed for 'IL2CPP' Scripting Backend