Only some diffs are shown whhen agent makes changes

Cursor auto updated me to 2.5.20 after I rebooted. I had reverted to 2.4 and it was working fine all yesterday. New day, boot up, same problem, and I check the version and its 2.5.20. I never agreed to install the latest update.

For the record, this setting makes no difference to the issue of showing diffs:

Update:
Setting this to manual stopped the auto updating after downgrading.