Works now with 20839. Woo!
I'm guessing the several metric shitloads I'm seeing of "ERROR: Variable x appears to be undeclared" in the fixpack and my own code is your new module? Please, please, please hide that behind a MODDER flag. I'm actively using unset source_res-named variables in my code, for example - if unset do the default thing, if set do what it says.
And I'm guessing "ERROR: Variable %%flags%% appears to be undeclared." means I'm using unnecessary amounts of quoting, but it will work nevertheless by some fallback? I have done READ_BYTE 0x0DDC0FFEE flags earlier.
Anyway, ugh. Probably useful, but noisy and intrusive as hell. I'm rolling back until you hide that behind MODDER.