Well, one of them does. Enabling Subscriptions for blog comments only causes subscriptions for blog posts to remain enabled.
Expectation

After settings page reload

Consequentially, we leave it like this

The Settings Saved message displays whenever any toggle is changed. There is no indication of save error except for Blog Subscriptions being re-enabled after settings page reload.
It seems like #5769 is back.
Until we solve this issue, you can go to Settings > Discussion in your dashboard. If you scroll down to the bottom of the page, you'll find the same 2 options and will be able to disable them from there.
This issue has been marked as stale. This happened because:
No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.
Reopening, as the problem still seems to appear on my end.
This issue has been marked as stale. This happened because:
No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.
still there
Most helpful comment
Reopening, as the problem still seems to appear on my end.