Edit unregistered using Visual Editor in desktop mode (in a laptop, using the Private Window feature of Firefox)

seems to be the same as

I consider this to be a very severe security flaw, which can be related with reported situations where people has been persecuted at work and on justice in Brazil for doing controversial editions unregistered using their workplace network at Wikipedia in Portuguese.

You can improve wording in https://pt.wikipedia.org/wiki/MediaWiki:Anoneditwarning to emphasize on issues that revealing IPs might arise to non-technical people. I did the same in Persian Wikipedia after 2009 protests and it helped.

In T262320#6444274, @Reedy wrote:

Edit unregistered using Visual Editor in desktop mode (in a laptop, using the Private Window feature of Firefox)

seems to be the same as

I see. I don't recall at all seeing that warning when I tested, probably because I was focused on the edition itself, so I probably simply dismissed it. When I saved the edition, which is what really counts, no warning appeared, at all. Now that you've shown where and when it appears, I've repeated the action, and I've seen it. I believe the warning should not be displayed before editing, but before saving, which is what really counts.

I've also returned to mobile, and as always, I saw a very striking blue button asking me if I wanted to edit without creating an account. Bellow it there are two grey, discrete buttons saying "Entrar" and "Registar". And now, finally, I noticed that above it is written, in a very discrete grey box which has passed undetected to me, the information that MY IP would be recorded on History. If I simply press the striking blue button and edit, no further information or warning is shown. Again, the warning should not before editing, but before saving, as that is what really counts. I can't post here a screenshot of this because for some reason the mobile phone do not allow it on that page.

As for the Wikipedia app, nothing appears at all, at least that I can find. All that appears before editing is this:

There is also not any kind of warning or information that choosing "editar descrição do artigo"means the edition is made on Wikidata. This has been confusing newbies who use the app to edit, as well as the seasoned users they reach out asking for help. A few days ago, a newbie reached out to more than 160 users on the pt.wiki Telegram group asking what should he write for the resume of Wikipedia articles. Nobody knew what he was talking about, until I've downloaded the app myself, experimented it, and found out what he meant was not related to Wikipedia at all, but to Wikidata. Things should not be implemented like this.

Paulo

In T262320#6444340, @Darwinius wrote:

I believe the warning should not be displayed before editing, but before saving, which is what really counts.

That might be an addition to be made. IMHO, I don't see anything wrong with the notification being there (as well) before actually making any changes. It saves people making the edits, then the edit being discarded when they don't want to save the changes and have their IP exposed.

In T262320#6444369, @Reedy wrote:

In T262320#6444340, @Darwinius wrote:

I believe the warning should not be displayed before editing, but before saving, which is what really counts.

That might be an addition to be made. IMHO, I don't see anything wrong with the notification being there (as well) before actually making any changes. It saves people making the edits, then the edit being discarded when they don't want to save the changes and have their IP exposed.

I agree, it is even better if it is shown both before editing, and at the moment the person saves their editions unregistered (and this time, much more strikingly).

At the Wikipedia app, however, I could not find that information in any place, at all. If it is there, it's very hidden.

I just tried again yesterday, and confirmed again that while editing what teh app wrongly calls "article description" - in fact, the Wikidata description - there is not any information anywhere stating that your IP is going to be revealed. I consider this a security problem of some severity.