Tc and tcn have one version of an added header for 120r_3 Nightingales while tl has a different one.
Tc/tcn:
<id>
p120r_3</id>
<head><del>
Il</del><al><add>
R</add>
ossignol</al></head>
tl:
<id>
p120r_3</id> <head><del>
Il</del><add><al>
Nightingale</al></add></head>
This is most obvious in the edition rendering:
The correct markup should be determined and then implemented across all three versions.
TC and TCN are correct; I changed TL to <head><del>Il</del><add><al>N</add>ightingale</al></head>
, reflecting the addition of only the initial letter.