The _env (lower case) keyword is no longer supported:

example cart: https://www.lexaloffle.com/bbs/?tid=48907

likely a general bugs on upper/lower case remapping.

Fixed for 0.2.5e -- this was a bug in the cart loader (uppercase not loaded as punycode) that seems to reveal itself when chain-loading .p8.pngs on the bbs, or any .p8 locally.