We've tried contacting OEMs about some of the more buggy behaviors we've seen related to their power optimization features. Unsurprisingly, even when we did get ahold of someone in the US who was senior enough to understand the problem, they had limited ability to influence the China-based operations of the company. Getting whitelisted seems nearly impossible unless you are a large company with a major presence in China and connections to the OEMs.

Google has hinted that they are working on something to improve the situation, but it's been years without resolution and the problem appears to have become worse instead of better.

There's a lengthy thread in this old Android bug report about the issue https://issuetracker.google.com/issues/122098785