I've figured out the reason, but not exactly.
The cause of this crash has something to do with the specific customization settings of my Sync app.
my Sync backup file. Please try to Restore this backup file to your Sync app and see if you can reproduce the crash
I don't know exactly why the crash only happens on the "Subcribed" feed on Burggit and not in any other lemmy sites
I unsubscribed from one community from rqd2.net and it fixed my issue. But it's weird that that fixed it since Burggit is still federated with rqd2