does anyone else find this problem? I can't even get out of the Minecraft launcher after clicking play. it straight up crashes. is there any way to fix this? the mods I'm using require placebo 4.60 or higher so I can't download another version as much as I'd like to.

I had the same issue, here are my log files:
debug.log
latest.log

well the original report has no data and your logs are mixin errors from other mods, nothing from placebo (placebo doesnt even have mixins).