shareReplay with refCount stops working

Describe the bug

When subscribe to shared observable multiple times internal connection to the source observable gets broken. It stops emit values on subscribe.

Expected behavior

Expected output:

first: 7.5.1
second: 7.5.1

Actual output

first: 7.5.1

Reproduction code

import { BehaviorSubject, merge, of, Subject } from 'rxjs';
import {
  shareReplay,
  take,
  takeUntil,
  materialize,
  filter,
} from 'rxjs/operators';

const shared$ = new BehaviorSubject('7.5.1').pipe(
  shareReplay({ refCount: true, bufferSize: 1 })
);

const isCompleted$ = shared$.pipe(
  materialize(),
  filter((n) => n.kind === 'C'),
  take(1)
);

const work = new Subject().pipe(takeUntil(isCompleted$));

merge(work, shared$)
  .pipe(take(1))
  .subscribe((value) => console.log('first: ', value));

shared$.subscribe((value) => console.log('second:', value));

Reproduction URL

7.5.1
6.4.0

Version

7.5.1

Environment

No response

Additional context

No response

Start with the provided reproduction using shareReplay({ refCount: true, bufferSize: 1 }) and compare its behavior in the linked 7.5.1 and 6.4.0 examples. The fix should preserve the source connection so both subscriptions produce the expected first and second values.