Google hasn't been sitting still. Both LCP and CLS have been seeing drastic changes already, so why not changing the FID metric?
Google Lighthouse has recently had an update. This may also have (negatively) influenced your scores. I briefly paid attention to it in a LinkedIn post, but in this blogpost I will go into it a bit more deeply.
The sad part of third party chat widgets is that it really is up to chat widget providers to improve performance, caring about the performance of their clients' websites and webshops at the same time. But even when they don't, we can make a difference.
I wrote my own chatbot + livechat and this created quite some fuzz on LinkedIn. I even received swear words, luckily just for chatbot testing purposes 😅. But let's talk about the harm of chat bots such as Zopim (Zendesk), and how I visualized this.