The game gives a crash report and says that ProbablyChests causes an issue, but then my latest log file doesn't say anything that's shown in the crash log.

Here's my crash log: https://pastebin.com/A0DVMGDN

Here's my latest log: https://pastebin.com/73xAKU4e

it says you are missing geckolib right at the top of the crash log

If Geckolib is required, then you should add it to the dependencies on the CurseForge page.