Apart from the potential solutions you offered, simply copying RefToolbar's code to zhwiki space should workaround the issue. A simple IA-privileged bot should be able to maintain the page if so desired. Not ideal, but better than status quo I think?

I received a lot of errors today (2021-11-08), but the timestamp is between 2021-10-10 and 2021-10-14. Below are some of the error messages received:

在T294448#7488230中，@Reedy写道：

As of the last month, pretty much all of these applets are broken.

Is this that they all broke last month (ie they all broke at the same time)?

Maybe yes because it came with that connection error. There was a problem in past and I implemented some tests here and upstream and there might be a remaining issue with https://github.com/btubbs/sseclient/issues/28 but I am also running sseclient 24/7 and haven't see such a problem lately.

Maybe want to ask the EventStreams team for help?

I haven’t encountered this error in the past few days (from 10-28 until today), and I haven’t modified/updated the relevant code. May be EventStreams server-side data error?

在T222885#7447032中，@Xqt写道：

@Shizhao: what are your Pywikibot as sseclient versions?

This error sometimes occurs when using page.save(), sometimes not

在T44473#5804309中，@Urbanecm写道：

There's https://meta.wikimedia.org/wiki/WMDE_Technical_Wishes/Move_files_to_Commons#How_it_works - maybe that can be considered too?

Please do not use Chinese-Sites for tasks that about Chinese dialects.

There is already zhwiki-l, why do we need to create this mailing list?