[Yandex Search API] Results from API are different than via regular search

[marm123]

One of our users reported that they are not getting the same results via SerpApi as they are through regular Yandex searches. I've discovered that the yandex_url contains the rstr parameter, which is always the negative of the lr (ref). I'm not exactly sure what this parameter does, but after removing it, the results are the same as through regular search:

Results with the rstr parameter:

Results with no rstr parameter (very similar to the ones the user gets with multiple pages of results):

Public links: Playground

Internal links: Intercom | Search Inspect

[hilmanski]

Another customer reported this issue.

Expected result:

received this instead:

I've tried to switch using different regions, but unfortunately, I can't replicate the original result. Based on the screenshot, customer using lr=10553, which is not available on our supported location.

I tried locally removing the rstr parameter; the result is closer.

Internal links: Front | Inspect | Inspect with lr 84