Disappearing line breaks in diplomatic edition

[ChiaraDipi]

<lb/>s which have an @xml:id containing the substring "_reg" in the middle of the ID are not properly rendered in the diplomatic edition:

<l n="1"><lb xml:id='facs_123_region_1598947625567_28l1_line' facs='#facs_123_region_1598947625567_28l1'/>Savoi fusse si nota</l>
l n="2"><lb xml:id='facs_123_region_1598947625567_28l2_line' facs='#facs_123_region_1598947625567_28l2'/>DaDivina in credibile beltezza</l>

is rendered as follow