Need help with "API on a list" threads synchronization

I am using “schedule API workflow on a list” inside a “schedule API workflow on a list”. Every time I trigger the algorithm, it gives me different results.

Am I right that this action works as unsynchronized OS threads?

For examle, 3 threads entered external API workflow on a list. Therefore, once 1 of them reaches 2nd action, he blocks it, and 2 other threads do not wait for him and move on ?

External “schedule on a list api workflow”:


Initially, there was “Interval” = 0 seconds.

please help, I can’t syncronyze threats

I’ve moved to recursively scheduled API workflows, but it did not help.

2й