ODT Template: first line field not working as intended

Hello everyone,

I am currently setting up an invoice ODT template with the tags found in the dolibarr wiki

Everything is working as intended, except for the first line tag in a table.

[!-- BEGIN row.lines --]{line_fulldesc}

is only working when I copy-paste it from the pre-existing template to my own one. When I try to manually enter or change the code / tag, Dolibarr does not fill the code upon export anymore.

Reverting my changes back to {line_fulldesc} also does not work.

Am I missing something? Any help is appreciated.