XF 2.1 Value display HTML issue...?

It seems I may have an issue with "Value display HTML" under Custom Thread Fields as it seems not to be editable? Under Customer User Fields it's fine, I can edit it no problem?

User field: Box to add code.
user_field.webp

Thread field: No box?
thread_field.webp

Any help much appreciated! (y) 😘
 
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