RSUs for EVGO vested soon – sell or hold?

Hello, I have a question that I hope is simple enough to clarify for me. I appreciate any advice or thoughts. My spouse has some RSU shares that will vest in July, and I'm uncertain what it means that the recent Tesla announcement has tanked (hopefully for the short term) the EVgo, Inc. stock prices.

I'm curious (as someone almost entirely unfamiliar with stock market behavior) if there's any typical advice I may be missing on when/if a person should hold RSU shares until a news announcement dip equalizes back to its average? Is that even a thing or is everyone now laughing because that's the magic question when engaging in the stock market?

I understand that any stock value increase/decrease after vestment date creates a capital gains situation with relevant tax implications, but is there a standard formula or view on selling vested RSUs during a reactionary slump or is that the name of the market game and we should just sell when we become vested to keep the income taxed simply. This is just one tranche and we may have better luck during the next vestment cycle.

I hope that makes sense and thanks for any other personal thoughts on it all!