Whenever I start with a new sentence or paragraph, Obsidian now automatically converts it to a capital letter (after the recent update).
However, I am one of the users who don’t appreciate this, since I make use of dataview and it makes a difference for a field name to start with small or capital!
I could not find any setting to switch it off, or anything online.
If you’ve got too many plugins to check there is another plugin, named something like divide and conquer, which enables you to enable and disable groups of plugins so it’s easier to find the culprit.