Every time I click “link” to share my invite link, the link is different - it’s reset automatically.
I do not reset the link manually.
Besides that the old links allow to add me.
Is it a bug or is it a feature? 
Android, 2.35.0
I think it always worked this way - producing a separate link for each person whom you invite upon each click. And this had never invalidated past links when producing a new one.
If you wish to refer to invite links you have given out in the past for some reason, you may want to list each of them in your chat titled “saved messages”, also noting for each the person you intended it for to possibly invalidate it after they join.
To invalidate an invite link you have generated earlier (so called “reset” in DC), you need to click the invite link yourself and then select the option to reset the given link.
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This answer in not helpful at all.
Even after “Reset QR Code” the old links allow to add the contact and see profile picture.
“If you wish to refer to invite links you have given out in the past for some reason, you may want to list each of them in your chat titled “saved messages”, also noting for each the person you intended it for to possibly invalidate it after they join.”
See also
Can’t find the forum post, but many people also publish a QR code for one profile and then transfer contacts to a new profile.