For example, we're introduced to this evil human(?) Who basically becomes immortal by like devouring the blood of spirits or some shit. After his initial appearance, we see him offering blood to this old rich human in return for something, clearly setting him up as a major villain... except we don't see him again for that season. Next season, he's seen again having basically tricked the FMC into giving him her blood (through a merchant goblin that offered her an item to let her turn back time which turns out to be a fake) and he revives something that was sealed away with the blood, again setting up something for that season... instead we get a really heartwarming story about a dad who turns into a tiger to try and cure his daughter by killing 100 dogs and feed her their livers lol
we also get these weird tangents that are in the middle of the season about the dog spirit's backstory which also great and touching but its something that would normally be in the intermission between seasons and not like the middle of it and leaving our MC's