Hi @Jonty
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others "I'll repost your solution in case you'd like to accept the answer.
Solution: The issue was resolved by uninstalling the existing runtime and reinstalling version 5.46.9020.1. After reinstalling, the Google BigQuery data source started working correctly.
It appears the latest runtime version may have introduced a regression, so using a stable earlier version like 5.46.9020.1 is a practical workaround until a fix is officially released.
Additionally, setting auto-update to false helped prevent the issue from recurring due to unexpected version changes.
Hope this helps others facing a similar issue!
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.
Please don’t forget to Accept Answer
and Yes
for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members