This is trival change I decided to fix it ASAP

Change 360368 had a related patch set uploaded (by Pmiazga; owner: Pmiazga):
[mediawiki/extensions/Popups@master] If extract ends with ':' treat it as generic extract

https://gerrit.wikimedia.org/r/360368

To be fixed in the service:

• https://en.wikipedia.beta.wmflabs.org/api/rest_v1/page/summary/List_of_bands_from_Finland

We talked about this in prioritisation. There's quite a few possible ways to approach doing this but we agreed we should not scan for ":" (because i18n) and we should do this in a generic way.

Change 360368 abandoned by Pmiazga:
If extract ends with ':' treat it as generic extract

Reason:
We want to do it in the backend, check task comments.

https://gerrit.wikimedia.org/r/360368

@phuedx - is there an example of how to exclude previews from summaries?

In T168328#3367304, @ovasileva wrote:

@phuedx - is there an example of how to exclude previews from summaries?

Err… I don't understand what you're asking. Do you mean excluding content from extracts? If so, then here's a bunch of templates on enwiki that use the noexcerpt class, which TextExtracts will strip: https://en.wikipedia.org/w/index.php?search=insource%3Anoexcerpt&title=Special:Search&profile=advanced&fulltext=1&ns10=1&ns11=1

@phuedx - I'm sorry, that comment made no sense at all. I was trying to ask if it's possible to build a template or a tag similar to noexcerpt that would instead display the generic preview.

Similarly, I was wondering if we could do the opposite. For example, if we fix this by making all pages belonging in category: disambiguation pages get the generic previews, would it be possible to create a template that manually adds the regular preview. As in, user hovers over https://en.wikipedia.org/wiki/1st_parallel and notices that only two items are showing on the disambiguation page, decides that a preview would be useful, and edits the article to include it.

This list page is a counter-example: https://en.m.wikipedia.org/wiki/List_of_Doctor_Who_serials
There's an argument to be made that the summary of https://en.wikipedia.beta.wmflabs.org/wiki/List_of_bands_from_Finland is bad. "The following is a list of bands from Finland:" might become "This article lists bands that come from Finland." It makes a lot of assumptions about how the content is going to be consumed.

@Jdlrobson - this is why I prefered the " : " solution versus displaying the generic per categories. Although, I'm beginning to think we should just make a way for editors to fix this when these edge cases arise.

Although, I'm beginning to think we should just make a way for editors to fix this when these edge cases arise.

HURRAH!
I do think this is the right and most scalable approach here. Searching for ":" makes me cry a little inside. It's going to create more unexpected bugs. I would put money on it.