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It looks like they do have...something.  From <https://support.atlassian.com/bitbucket-cloud/docs/hyperlink-to-source-code-in-bitbucket/>:

> URI Template for src
>
> `{+bitbucket}{/owner, repository_name}/src{/commitish}{/filepath}{?fileviewer}{#fileline}`

Despite the flakiest syntax for describing a URL that I have ever seen, up to the query string represents a normal URL to a file in some repository.  The `fileviewer` query variable specifies a specific view for the file, I gather, but I gather that you don't care about that, though it *may* (I didn't investigate) affect the output difference that you mention.

The last piece, then, is the key, where they describe `fileline` as...

> The target file name plus the line number, separated by a dash. Without the fileline segment, the URL simply navigates to the target file.

To confirm that they *did* mean to say "just repeat the name back-to-back for no clear reason," they supply an example of `test_auth.py-29`.  Slap a pound sign in front of that, and you have your specific-line link.

Searching for a random project on Bitbucket to test, then picking a file arbitrarily, I could use that template to verify that it works with <https://bitbucket.org/dismine/valentina/src/master/.travis.yml#.travis.yml-29>.

If you want a generic approach that'll work anywhere (in other words, doesn't require whatever magic Bitbucket's back-end does to direct to the line without adding an HTML anchor), you can also use the new HTML text highlighting, replacing the file-and-line offset with the horrifying-looking `#:~:text=` and the text of the line that interests you.  For example, you can link to anything on this page, such as <https://software.codidact.com/posts/295206#:~:text=most%20of%20the%20time>.