Exception chain change broke grouping

[sl0thentr0py]

if we look at these two issues, they're identical except that the in app chained exceptions are reversed
https://sentry.sentry.io/issues/6591547772/?environment=prod&project=1&referrer=similar-issues
https://sentry.sentry.io/issues/6722355433/?environment=prod&project=1&referrer=similar-issues