Hey @furlxy 
= thanks for reaching out. I can’t say for sure, but the main culprit here is likely browser extensions interfering with your dev environment – that SendBeacon failed error and the Immersive Translate error are usually related to extensions or ad blockers interfering with a site’s CDN requests.
If you’re still seeing the issue, can you try loading your app in an incognito/private window without extensions enabled?
For the Polaris issues, are you seeing any errors pop up in the use of Polaris (like tables looking incorrect, etc)? The table warnings are accessibility reminders – you need to add a <s-table-header-row> component with <s-table-header> children at the top of each table (before <s-table-body>). It usually shouldn’t break your app, but proper table structure is part of the Built for Shopify requirements and general accessibility best practices (it can also affect how tables are displayed):
Hope this helps, let me know if I can help out further at all 
