Telegram Secret Chat was accepted but online status not updated?

I've already noticed the following with two people on Telegram. The online status is enabled for both me and my two contacts, meaning it's not hidden. For example, my friend's online status says "last seen on April 6, 6:22 PM." Although the person's status indicated that they weren't online, the secret chat was accepted today,…

Why can't I see a person's online status even though it's set to public?

I can't see the online status or the last seen online status of just one person. However, the person's online status is public for everyone. They showed it to me, and I'm not blocked. However, I can't see when the person is online or when they were last online. As I said, the status is…

If you record a 5-minute voice message in WhatsApp, will everyone in your contact list see that you are online for 5 minutes at a time?

Or does only the recipient see that you are recording audio? Or do others briefly see that you are online and the online display goes out after a while? I want to record a long voice message for someone, but I don't want certain people to see that I've been online for so long. Are…