Apache Royale struct foe Leaflet openstreetmap doesnt load map it release build

Question

As title suggests, i have created a struct for Leaflet js libary to add an openstreetmap.

this works perfectly well when compiled in debug mode

-compiler.debug=true

strangely, just simply compiling in release mode i get no map. I can see the leaflet library has loaded but no tiles load, no network requests for tiles. No errors, No cors issues (tried own tile server).

I am at a loss at what to try next, any ideas?