I'm using Ventura 13.4 and Alfred 5.1.1 [2138]. This issue began a few days ago with the previous versions of MacOS and Alfred 5.1 before I updated both.
I had always used a double-tap of CMD as my hotkey. It's reverted to OPT+SPACE. Whenever I try to reset it to a double-tap, I get the error notification "Unable to save 'local.hotkey.default' with value'{".
I didn't knowingly make any changes to settings preceding this problem.