Subject-Verb Agreement?

Greek Koine and Biblical and Medieval Greek
1

“πάντα δι’ αὐτοῦ εγένετο”
“All things were made through him” -John 1:3

It seems to me that πάντα and εγένετο are plural and singular, respectively, shouldn’t they match?
Is this just something about Koine Greek I’m not understanding? Thanks.

2

Neuter nouns, being collective, take singular verbs in almost every situation.

EDIT: “often being collective”

3

Thanks Again!