Non-interactive elements receive keyboard focus
Non-interactive controls or elements (read-only values) receive focus on tab of the keyboard.
Steps to Reproduce
Create a section with formatted text, table, or input control with read-only mode.
This behavior is as per Pega product design.
Here's the explanation for the reported behavior:
When the pega.u.d.isAccessible is true in the Document Object Model (DOM), the tab-index attribute is added and is set to 0. When the tab-index is 0, the element or control receives focus on tab.