Thanks for reaching out.
I have checked the assigned Post Category page and found the Archive Description is showing fully. Please find the Archive Page URL in the secure note. If that is not the case and you are trying to point out something else, please provide any screenshot marked with the issue or any video that help us to recognize the problem.
That is correct. When I went back into the Category editor to view, the <p> tags you had entered, they are no longer there - exactly as your screenshot! It seems you can place them in manually (not through the visual editor), but every time you revisit the editor the manually added <p> tags are removed, despite WordPress’s instructions on how to make changes to functions.php to allow HTML in the description.
Is there anything which can be done to correct this?