https://cdn.discordapp.com/attachments/339127815666532352/784750761476751360/unknown.png
As seen on the included screenshot: the Metal Press' mesh has a hole on a little corner on the Output side.

Using Spectator mode to fly into the Press, the face seems to be there, just looking the wrong way.
https://cdn.discordapp.com/attachments/339127815666532352/784754876684435466/unknown.png

Crashlog at https://pastebin.com/tSuJcpG9

Versions & Modlist

Minecraft 1.16.4, Forge 1.16.4-35.1.5, IE 1.16.4-4.1.1-128