"Attachment not found": Existing image is lost if "Discard changes" is clicked after a reminder triggers

[XYIheng]

Description:

There is a state conflict between the reminder trigger and the "Discard changes" action. If a user opens a previously saved note (which contains an image and an upcoming reminder) and waits for the reminder to trigger while the note is open, clicking "Discard changes" afterwards breaks the attachment.
When reopening the note and tapping the image, a Toast shows "Attachment not found", indicating the file or its database reference was incorrectly deleted.

steps to reproduce:

1. create a note with image
2. set a reminder for this note (e.g., after one minute)
3. back to the note list
4. enter the note again
5. wait until the reminder reminds you
6. click the options button in this note
7. click "Discard changes"
8. enter the note again
9. Tap the image thumbnail
10. see the error: a toast shows that "Attachment not found", and the image fails to open

Expected behavior:

It should open the image without showing the toast.

screenshot

Environment:

Omninotes Version: 6.3.1