The pl2 layout is missing a correct definition for the key <AB10>. Just as other QWERTZ layouts this key should be defined as minus, underscore. Instead it's defined as slash, question, providing a second question mark to the whole layout and causing the minus and underscore keys to be missing.
Could you please let us know - what should be in the groups 3 and 4? For example: key <AB10> { [ minus, underscore ] }; key <AB10> { [ minus, underscore, endash, emdash ] }; key <AB10> { [ minus, underscore, asterisk, NoSymbol ] }; etc...
I think the best solution would be using the definition from the latin(type2) layout: key <AB10> { [ minus, underscore, dead_belowdot, dead_abovedot ] };
commited.
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