Read-only custom field is logged (as empty) in Change History when issue is edited or moved

When editing some fields of an issue (like "Fix Version", but not "Assignee") a change is also logged in the Change History about "Read-only Text Field" custom fields (which should only be modifiable through an API). The change identifies the old value as non-empty and the new value as empty.

See screenshot attached ("ARS" is the read-only custom field).