This is the 16997th most frequent Polish word.
wystąpiło
"Occurred" or "appeared."
Here, 'wystąpiło' is used in its base form 'wystąpił', meaning 'performed'; it's the past tense related to performance or appearance.
Artysta wystąpił na scenie przed dużą publicznością.
The artist performed on stage in front of a large audience.
In this context, 'wystąpiło' again denotes an occurrence, signifying something unexpected happened or arose.
W systemie wystąpiło nieoczekiwane błędy.
Unexpected errors occurred in the system.
The word 'wystąpiło' is used here to indicate that an event (a delay) happened, describing an occurrence.