Has Gmail team introduced some change to "reply" mechanism recently?

Here is, what I found (can't figure out exact time frames -- sorry):

1. Some time ago:

• in any conversation between me and someone, no matter if I clicked Reply in mine or his/her e-mail, I was always replying to him/her, never to myself (not so obvious, but very handy and useful!),

• if somehow I managed to reply to myself and sent such e-mail, it was immediately moved to Inbox and presented in bold (unread message), so I could at once find out, that I made a mistake and instead of sending my reply to OP, I sent it to myself.

2. Currently:

• in any conversation between me and someone, if I click Reply on e-mail sent by him/her I'm replying to him/her, and if I click on any e-mail sent by me, I'm replying to myself (reasonable -- but completely not useful!),

• if I reply to myself, I never see this e-mail in Inbox, it only stays in Outbox as sent.

Original (previous) solution wasn't maybe too obvious, but it was extremely usable. No matter in which part of me-someone conversation I clicked Reply, composed message was always sent to OP and never to myself. So, there was no problem at all, if I wanted to send another message, after previously sent one, without waiting for a possible reply to it.

If, I'm not mistaken, the same scheme is implemented in many other mail clients like Thunderbird etc.

Now, if I click Reply on "my part" of conversation, I'm replying to myself. So, If I want to send another message, after previously sent one, I have to always click Reply on OP e-mail, not on my own. I don't know any situation, where someone would like to reply to himself, so I find this very useless.

Because -- in addition -- I'm not "alerted", that I sent a reply to myself (no sign of e-mail in Inbox, though it should be there, as I sent it to myself), I'm simply loosing track of who I'm replying to.

I can't count, how many conversations I now have broken or at least suspended for some time, because I found out after few days, that OP didn't received my reply at all. I clicked Reply on my own e-mail and sent the whole message to myself, not to the person, I actually wanted to sent it to.

Can someone confirm this change? Is this permanent? Or just a bug, that is going to be fixed? Can anyone write anything about logic behind introducing this change (if there is any logic behind it)?