Seeing this starting to happen again, since earlier today (11am Pacific).

And again around noon pacific yesterday (Sun Feb 21) on en.wikipedia.org... and again now (9am pacific Mon Feb 22).

In T218511#6807566, @Mathis_Benguigui wrote:

I just had the bug again 3 times today (with the same page).

And we're back where it's happening again, right now, en.wikipedia.org

Sure:

What I did:
looked at pages that my watchlist indicated had been edited since last time I saw them.

Doing it on en.wiki right now (Tue Jun 2 2020 7:53 PM PDT). My watchlist is 2,492 entries.

Happening a lot in the last few days, including right now, on en.wikipedia.org

Yes, it's become more prominent again in the last day or two on en.wikipedia.org.

In T218511#5737274, @IKhitron wrote:

And now it is every half of hour.
We are group1.
Maybe the rest will get this tomorrow.

What do the developers need from us to fix this? It's been exceptionally more frequent in the last week or so, to the point where following my watchlist is becoming difficult. This issue will drive people away from the project, so tell us what you need in terms of logs/timing/etc.

And for the last two days on en.wikipedia.org... could someone please fix this?

It's doing it again. *sigh*

And again... I've just visited both pages below (Kal Penn and The DUFF):

This bug is going crazy right now

In T218511#5405862, @Joeyconnick wrote:

Happening for me right now, while using "&safemode=1"

Seen changes are showing in my watchlist even though I have it set to show only unseen.

Happening for me right now, while using "&safemode=1"

Ah... thanks! Newbie lack of understanding of the process. 😳

Uhm... definitely not resolved. Am still seeing pages I've visited showing up (bolded) even though I have my Watchlist filtering for "Unseen changes" only.

So some points: no, there's no harm in it being there, but there is a certain amount of harm (just wasted space) in having a wide-ranging bot add it constantly when there's no need for it to be added. Also, "this has been the standard" is no kind of argument against changing behaviour that is unnecessary, because by that reasoning we'd never change anything after its initial setup.

Awesome... thanks!