Isometric Renders forcibly initializes AWT, which causes the game to never launch on MacOS. AWT is incompatible with LWJGL on Mac due to Mac's rendering constraints. An alternative method for copying images would be necessary. I know this is meant to be a Mac workaround, but it does result in the game hanging as soon as the window tries to open.

oh right yeah this is a 1.18.2 instance I literally forgot lmao

never file issues while tired folks

Oh, it looks like there's a command-line arg for disabling it? I'll give that a look. Might be nice to have that documented.

This should be fixed in 1.19, but it is not backported for the 1.18.2 builds.
You can however use the isometric-renders.disableClipboard system property to disable it.

Is it still present in 1.19?