@amWhy I am grateful for your positive words.

@lonestudent ar I see. I didnt realised that all the downvotes are direct towards one users.

@lonestudent @XanderHenderson The answer was posted about 1 1/2 hours after the question was closed. As to how this can happen, please see Submitting an answer to a closed question (and there are other related questions on the Meta site). Its accepted answer states it's a server side check, with a grace period of up to 4 hours allowed. I also saw a Meta answer once stating an answer was submitted just a few minutes shy of that 4 hour limit.

@Verónica do you still care for the information you asked about. I can answer something, it's not problematic as a question.

@lonestudent I am not sure whether this is what you had in mind but I left a few comments in the Math Meta Chat: chat.stackexchange.com/transcript/64952/2021/5/14

@JohnOmielan I should have been more specific: there is a client-side check to determine whether or not the "submit" button should be active. On most desktop clients, the button is disabled when a question is closed. On the mobile app / site, this button is not disabled.

Hence the mobile platform is more borken.

I did not know that word: bork, borken.

@MartinSleziak Thank you very much! I could not fully understand. I had some more little question. In which room can I give it?

@MartinSleziak now, I almost got an answer to my question. (on your link) Thank you.

@quid :) hehe yes, but not now. I'm very busy, I'll ping you on another time.

This answer came up in the review queue. I clicked on the question purportedly answered by that answer, and lo' and behold, the question was closed: "Closed. This question does not meet Mathematics Stack Exchange guidelines. It is not currently accepting answers."

So I tested the audit, and failed it: I was supposed to click: it's okay. But that goes against the EoQS... That's absurd.

Indeed, we need a reason to vote to delete an answer, because it answers a PSQ without any attempt to help the asker improve their question. And if the algorithm used in audits can't accommodate auditing users on how they respond to answers to PSQ, then something is drastically wrong.

^^ Note that in the particular case I spoke of above, the question, and hence the answer, have been deleted. So there is no action to take in this case. But we need the audit algorithms to learn not to feature highly upvoted answers to very low quality questions, as audits.

But as long as we are making requests: I want in invisible pink unicorn. :\

That being said, I think that a meta proposal would be in order.

I don't have time right now, but I'll try to write something up next week.

(Unless you get to it first.)