My LG is the same. They are going through HUGE developmental stages eg. Trying to crawl, stand to walk, their at the age where they aren’t burning enough energy to make them sleepy
It's likely to be a sleep regression/developmental leap at that age. It's also normal at 8/9 months that babies sleep 11-12 hours at night and 2-3 hours during the day over 2 naps totalling 14 hours. They can develop a lot at this age with rolling/crawling/walking etc then throw teething and weaning into the mix and babies sleep schedule can take a dive. It can be hard but try not to put any pressure on yourself or your little one to get those long naps. You could always set up some toys in the kitchen or wherever you are needing to be so he can play and watch you get jobs done if he really is opposed to a nap.
Just going through this with my 9 month old. I think we’re coming out the other side of it now as she’s started having some better days again. It’s tough but it is a phase.
My lo is the same currently only getting 2 half hour naps a day 😭
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