Hey Yatish,
I’ll share this info with our team. Unfortunately, this is unlikely to be something that we’re able to fix as the DOM isn’t an officially supported interface. It is likely that we introduced a new code path that is required by a recently launched feature or underlying architectural change. Since the DOM is not an officially supported API, our team does not ensure that breaking changes aren’t introduced.
Our recommendation for building integrations that extend Trello continues to be that Power-Ups are the best platform to use to extend Trello’s functionality. We do our best to keep it stable and not introduce breaking changes.