I'm pretty sure native runtime didn't help, at least for me - I compiled all the required 32 bit libs and still got the OOM errors, just in a different library than pango, so I think it may be a more systemic issue.
That said I might have miss…
I tried the linux-lts kernel and the game started working for me as well. Without it it wouldn't work either with or without steam runtime. So it seems like it's some change on part of the kernel that broke things.
My two cents:
I've also get a crash on a x86_64 Arch, just launching the training map. Crashes also happened when trying to optimise, didn't check what causes them then though.
For me the cause is a nullptr dereference a couple of frames…