Thank you @benwiggy and @dko22, to answer your questions.
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The library is rather irrelevant since I get these issues across the board.
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All the “stop” articulation does is press a keyswitch to allow polyphony. It has no dynamic associated with it and this happens in purely sustain or legato passages too.
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The expression maps are set to use exclusively CC11, velocity is disabled.
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I have of course tried the line tool and disabled, per your suggestion, the dynamics humanization (set to 0%).
This is the result using the Line Tool:
This is the result using the drawing tool
And this the result if I try editing it from the dynamics lanes instead.