There is a problem when removing actions from
dummy events that are postprocessed. For example, consider you have two
dummy events $l1+/1 and $l1+/2. If you postprocess $l1+/1, the code
removes the event $l1+/1 and the action $l1+, and this effectively removes
$11+/2 also. This causes the er to be bogus as there are still rules
using $l1+/2. The workaround is to never remove events. It is a bit
obnoxious and should be fixed, but it does not really cause any problems
to leave in dummy events that are not used.
There is a problem when removing actions from dummy events that are postprocessed. For example, consider you have two dummy events $l1+/1 and $l1+/2. If you postprocess $l1+/1, the code removes the event $l1+/1 and the action $l1+, and this effectively removes $11+/2 also. This causes the er to be bogus as there are still rules using $l1+/2. The workaround is to never remove events. It is a bit obnoxious and should be fixed, but it does not really cause any problems to leave in dummy events that are not used.