Bug: some training pages do not work

[crystal canyon]

https://lichess.org/training/Tvw54 does not work, but it's supposed to, was working fine yesterday
https://lichess.org/training/of-player internal server error

clicking on seemingly any option from https://lichess.org/training/themes returns either an internal server error or a "No more puzzles available! Try another theme." error.

The ones I tried specifically were https://lichess.org/training/capturingDefender and all of the above