Bug - {br} does not work right when using it in a complex function

When used in a complex rotation function like:

{abright} and ({swsst}>0 and math.floor({swrss}) or var_ms_s) or {br}

It shows wrong radom values (aparently). It must show 0 but it shows values like 40

If I used {bl}*3.6 instead of {br} it works correctly

{abright} and ({swsst}>0 and math.floor({swrss}) or var_ms_s) or {bl}*3.6