Hello elitezai,
Welcome to the Apple Support Communities.
It is possible the note is no longer being shared. You can use the instructions in the following Apple Support article to share the note again:
Share notes and collaborate on iPhone - Apple Support
You can also check the current sharing settings following this part of the article:
"Change sharing settings
- Manage a shared note: Tap
, then tap Manage Shared Note. - Manage a shared folder: Tap
, then tap Manage Shared Folder. - Remove people: Tap the collaborator you want to remove, then tap Remove Access.
- Change access and permission settings: To change the settings for all collaborators, tap Share Options. To change the settings for an individual collaborator, tap their name.
- Stop sharing: When you choose this option, the shared note or folder is deleted from the devices of the other participants."
Please reply back if you continue to notice missing features once the note has been confirmed to be collaborated with the other user.
Cheers!