switchMap not unsubscribing depending on import of Observable

RxJS version: 5.5.6

In our app, we today encountered an issue with code which is essentially the same as the following.

[Removed in favor of the repository with a reproducable version posted below]

The behavior we saw was that all the (temporarily) started timers kept executing in parallel, as if switchMap didn’t unsubscribe from it when id$ emitted.

After a lot of debugging, I eventually figured out that the bug only arises when Observable is imported as

import { Observable } from "rxjs";

but not when imported as

import { Observable } from "rxjs/Observable";

Unfortunately, I cannot reproduce the issue on Stackblitz independently of how I import. My feeling here is that there is some dependency which patches Observable, perhaps with an older, faulty version or something.

However, the problem I am having with this theory: I would think that in this case it breaks when importing from rxjs/Observable, but not when importing rxjs. But what we see is exactly the opposite.

I realize that with rxjs 5.5.0, patching Observable isn’t the choice of things anymore and we do intend to move away from this. In the mean time, I would really like to understand how importing from rxjs breaks behavior so drastically and would appreciate any ideas on how to figure out what is messing with us here.

[kayjtea]

Reproduce steps:

https://github.com/kayjtea/rxjs3306

The problem arises from mixing the full RxJS import with the patch mechanism.

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