After installing the module and inserting html into a form, updating any user registered with this form will results in a fatal error (white screen).
Try to reproduce with a "virgin" drupal or check if this happens due to a conflict with another module. (I thought this happened bacause of a conflict with the Profile module but nope).
Try to reproduce and figure out the specific error that is being caused (I've no idea how to do that).
Fixed
1.0
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
You can try the path from #3350712 🐛 Fails on Drupal 9.5+ Fixed issue.
Anyone facing this issue should update to
Readonly Html Field 1.0.2 version →
and then execute drush updb to clean up erroneous data from "Readonly html field" fields.