Follow-up Comment #6, bug #68831 (group groff): This is the current state-of-play I believe:-
eqn and tbl: assume lines are in mode 1 on entry, if in mode 2 the line
thickness will be wrong.
pic: sets mode 1 on entry, but if 'linethick' is changed from default of -1 it
uses mode 2 to set line width. On exit it switches to mode 1.
Each of these should store the value of \D't n' on entry, switch to mode 1 (if
not already) and then restore the value on exit.
I have not looked at 'chem', probably similar.
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