stream: fix backpressure when multiple sync

PR-URL: https://github.com/nodejs/node/pull/19613
Fixes: https://github.com/nodejs/node/issues/19601


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>