Attempting to invoke a metatable's method in a native library throws IndexError

[EmmaTheMartian]

import random
let rand = random.new()
print(rand.next())

# Output:
Error in main.metis:3:11: IndexError: Cannot index a non indexable value of type native with index "next"

|> print(rand.next())
             ^~~~~~^

This also occurs with the Regex library:

import regex
let a = regex.compile("a")
let matches = a.match("asdf")

# Output:
Error in main.metis:3:16: IndexError: Cannot index a non indexable value of type native with index "match"

|> let matches = a.match("asdf")
                  ^~~~~~~~~~~~~^

I'm not exactly sure what causes the error, however after looking at source code I have narrowed it down to being specifically native libraries that throw this error.

I am also using the latest version built from source instead of the latest one from releases, if that changes anything.