The game crashes/hangs for ~1 minute when shift-clicking to craft multiple at a time on version 0.2.45. It works fine if you are only crafting 1 recipe worth but any more will result in a crash/hang. If you do not interact with the game while it is hanging it will recover and show Connection Lost - Timed out - Back to Server list but will crash if you do interact. This does not occur for me on version 0.2.43. During this hang my CPU is still being utilized by the game (~15-20% on Ryzen 7 5800H).
This may be related as there are several other bugs with crafting since 0.2.43 such as; when single-click crafting with multiple recipes worth in the crafting grid, the input resources will not be consumed but you will still get the result. i.e free crafting. If only one recipe is in the grid a ghost item will still be present in the output.

The logs provide no useful insights as when the game hangs, it looks just like a save and exit to main menu as shown in
latest.log.

It is worth noting that I recently copy-pasted my curseforge Backups/Downloads/Install/Instance onto my C disk.

Edit: Just downgraded to version 0.2.44 and the game will no longer crash. The only change noted in the changelog is "Updated Gregtech again to fix issues"

Duplicate of #1327, #1331, #1332, #1333, 1334
Cause is FastWorkbench, hotfix releasing soon