Unable to resize both box and its content by holding command key in Indesign 18.2 version

Did you skip a bunch of upgrades? There were some changes quite some time ago with auto-fit that did affect this, but it's nothing that can't be overcome.

Nothings changed here, still works. Third party app interfering?

Adding to Steve's advice, just because he didn't say it outright, those features have not changed.

Here are two things you can try:

(1) When you a major update, sometimes it's helpful to restore your InDesign preferences and caches, This article explains how:

https://www.rockymountaintraining.com/adobe-indesign-rebuilding-preferences-cache/

(2) The second thing is that there could be an application or extension which is grabbing your keyboard shortcuts like Command or Shift. It's easy to test this: Quit out of InDesign and restart your computer. As you're starting up, hold down the Shift key to disable startup applications. Then IMMEDIATELY open InDesign and see if the keyboard shortcut which was the problem is now working. If it is, they there is some app or extension which is interfering. Open apps one at a time, and test whether the keyboard shortcut is working to find the culprit.