Copying text frames from older versions of InDesign (example 2022 to 2025 – v.20.1) results in a pdf frame, meaning the text is uneditable. The only workaround I have discovered is to copy the text itself, paste it into the new document, and reformat the frame. I believe the discussion posted here - https://community.adobe.com/t5/indesign-discussions/indesign-locking-text-frames-with-old-id-files/m-p/15147987 – is referring to the same issue.