I saw the movie a few days ago and while I didn't think it was bad, I'll admit the script is a mess. Some parts are a little hard to follow or poorly explained. Someone either got a bit lazy with the writing or did a poor job cutting it all together.
It will be interesting to see how the post-strike/pandemic era of the MCU plays out. The 2007 strike made for like 5 years of shit movies. The pandemic and this strike were significantly longer and had a much higher toll on every level of movie making. I don't harp to much on scripts from serialized content, but I do imagine it will get better in time for the X-Men and Fantastic era of the MCU.
It feels like an editing issue. The film was fast paced and a lot of scenes just ask you to assume that they make sense. In truth they probably do, but they need a little bit of explanation.
Let's talk Flerkins for example. Early in the film Goose eats some bad guys, teleports to Kamala's living room, then spits them out. No one really comments on it. No one found it weird. We just defeat the bad guys and move on.
Next Goose spits up some science equipment. We learn that they've been missing for a while. They look fine but no one mentions that they still work, or we're otherwise still preserved.
Finally we have the musical Memory scene. Ignore for a moment the eggs that hatched. Ignoring for a moment it happens when they've run out escape pods. We have "kittens", we've established that Flerkins can eat people and they can hold what they've eaten for a while. So while the solution makes sense, and on paper they've earned the moment, it takes a moment to really put it all together. As a result it feels rushed and instead of just enjoying the scene you're left wondering if it makes sense.
We're only talking about cutting a few minutes here and a few minutes there, but it adds up.