Newsletters show '0 subscribers' even though members are subscribed

[jojost1]

When I go to a member I can see he/she is subscribed:

However Newsletter settings show 0 subscribers: [see reply below for screenshot]

And publishing a post also shows 0 subscribers: [see reply below for screenshot]

Therefore I can’t send any newsletters. This used to work before, but stopped working at some point. Example of ‘member activity’ where you can see it did work before: [see reply below for screenshot]

The only thing I do is adding new posts every now and then, and update Ghost to stay on the latest version.

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Setup information

Ghost Version
5.69.0

Node.js Version
v18.16.0

How did you install Ghost?
Self hosting

Provide details of your host & operating system
VPS, Linux debian 5.10.0-18-cloud-amd64

Database type

The admin shows:
Environment: development
Database: sqlite3

ghost version outputs:
Ghost-CLI version: 1.25.3
Ghost version: 5.69.0 (at ~/webserver/meisopreis)

ghost ls outputs:
No installed ghost instances found

Thank you!

[jojost1]

However Newsletter settings show 0 subscribers:

[jojost1]

And publishing a post also shows 0 subscribers:

[jojost1]

Therefore I can’t send any newsletters. This used to work before, but stopped working at some point. Example of ‘member activity’ where you can see it did work before:

[brno]

I have exactly the same problem.
I just upgraded my self hosted Ghost (using fly.io) to the version 5.7.0.3, but it doesn’t solve the problem.

[brno]

I’d be so happy to get some information about the way to solve the problem!