Client Crash when placing Andesite Catwalk Stairs with Oxide Iron Scaffold Slabs/Stairs

[Puffer-Slime]

Full modpack Crashlog: https://mclo.gs/w8hMKOE

Reproduce-able in minimal mod conditions listed below:
Minimal modpack Crashlog: https://mclo.gs/Sseoe6x

Tested and confirmed on different client computers, OS version, launchers, and hardware. (see logs for more information)
Final Picture showing the moment before disaster, see drawn out block in hotbar.

[Puffer-Slime]

@RoarkCats

[RoarkCats]

World gets stuck in a client crash loop
Blocks have to be placed directly next to each other, may be trying to connect weirdly or a block update issue?
Tested with various other blocks from both mods and other mods, no further crashes.
Tested tick frozen still crashed (bc client crash)