Normally you put 'forward to' on different lines, by putting them in one lua script they share the same association (19.x), which breaks. You can fix this by saying:
script('forward to REVIEW_3 channel 0; forward to NETA channel 1; forward to PREM01 channel 2; forward to PREM00 channel 3; forward to NMR1 channel 4');
script('forward to PACS channel 5')
Default each 'script' call will use channel 19.0, 19.1, etc.
Therefore the second breaks as it reused channel 19.0!