Latest version - 1.4.9999 r45042 stand alone (not Steam)
The same thing seem to happen with strings also but not with numbers.
edit: strings work fine with older version of asset: Apollo.gmez
edit2: same problem with dll from 'Apollo-GMS1.gmez' that needs debug runtime
edit3: this appears to fix the issue: in 'lua_global_get' replace
return lua_buffer_read(b);
with
var tmp = lua_buffer_read(b);
return tmp;
some GMS internal black magic I guess