I don't know if this is something the lichess team wants to spend time fixing, but the v2 upgrade broke embedded studies in Firefox ESR (60.6) under Linux for me (using Debian's firefox-esr package). The move list does not appear:
imgur.com/a/RFtYSQw
The non-embedded version of the study works, it is just the embedded version that seems to have some kind of CSS issue.
imgur.com/a/RFtYSQw
The non-embedded version of the study works, it is just the embedded version that seems to have some kind of CSS issue.