Recreate Bug:
-Select Comment tools
-Select Drawing tools -> Text callout -> create a callout box
-Type any text and then click away. The comment pane will show the corresponding text for the callout box
-Select the comment in the Comment pane, edit the text and then click Post.

The text within the callout box will not update properly to the new edit.
Only ways to fix it is to drag the callout box itself and move it a little bit and the text within the callout box will update, or have the user edit the text within the callout box instead of in the comment pane.

Attached is a video recording of me showing that using the text box option works fine, but using the text callout box option does not, even though those two functions should behave the same way.

Already contacted the Adobe support team multiple times. Somehow they are adamant that this is "by design", even though we've also tested older version of Acrobat (ie Acrobat X Pro) in which the text callout box works as intended. (comment updates instantly)