Suspense throws undefined error

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• #414 by @ToastHawaii — closed without merging

We upgrade from a very old projekt ([Openki](https://gitlab.com/Openki/Openki)). We started with blaze and iron router and now migrate to react, async await and meteor v3 step by step. ([Working Branch](https://gitlab.com/Openki/Openki/-/commits/dev-meteorv3))

Currently we found out that we need `react-meteor-data/suspense` to support some async await calls on loading data.

If a change happend in the UI the render breaks and [`if ('error' in cachedSubscription) throw cachedSubscription.error`](https://github.com/meteor/react-packages/blob/master/packages/react-meteor-data/suspense/useSubscribe.ts#L38) is thrown with a `undefined`.

I gues it happens because we have mixed up a lot of diffrend librarys with diffrent Tracker in it and something is not update nice. We use blaze, react, react in blaze, iron-router (fixed for v3),

Start with the linked useSubscribe.ts location, especially the cachedSubscription error path, and reproduce the failure when the UI changes in the Openki dev-meteorv3 branch. Compare the involved Tracker-based libraries and determine why the thrown error is undefined; done means the render no longer breaks and the failure is covered by a reproducible check.

Written by the indexing model from the issue text.