There is a trick to get the undisambiguated postag. But I could not find it. What is the correct way?
Does raw_pos help (doc)?
You can use <pattern raw_pos="yes">
It is a bit buggy. I could solve the bug, but we would need to modify some rules that depend on the current behavior.
Bug should generally be removed. But I cannot see how large the impact is.
How many rules are affected? In which languages? So far nl did not use raw_pos. I ran into a rule that was obstructed by a fine disamig rule, which went wrong because of the disambiguation.
For now, I simply removed the disambig rule. A longer pattern might also help.
Bu I could have fixed the rule in this case using raw_pos too.
Ther are worse bugs in disambiguation, like min and max not working properly and removal of postags is flawed also.