Hi Cayetano Fernández,
Thanks for your patience and cooperation!
Regarding your issue, I did a test again. When I create a new form and after receive the forms response, I given the related points as you mentioned, then create a flow as required, while the related points won't show in the SharePoint list.


Considering our test result, as we also can reproduce it, we think it might be a limit of Power Automate flow to connect with SharePoint list, sorry for the inconvenience caused at your end again. To address your concern, we kindly suggest you go to SharePoint
UserVoice which is the Official platform for the developer team to collect great ideas from users and further improve our product. As you can see, many features of current programs have been adopted and designed from customer's voice, we also welcome to
hear your voice in that platform.
Your understanding and cooperation are highly appreciated!
Stay safe and have a good weekend! 😊
Best regards,
Gloria
[Updated by Gloria Li MSFT, 9:10 PM, Nov 6, 2020 (UTC)]