Used engineering plans and it failed and disappeared

[Minearm]

I used the schematic to learn how to recharge pummelers but it failed once the progress bar reached the end and disappeared from my bars, please help I spent a lot of time farming that recipe.
https://database.turtle-wow.org/?item=51801 link to schematic

[Minearm]

character it happened on is Junglesoda

[Minearm]

also I have deleted WDB folder
opened another prof tab then engineering again
neither worked

[Geojak]

Happened to me too, there I a github issue about Thai from January