Mine is also crawling and standing and is fine in sleep sack
My first had a sleep bag until age 2, even though she could crawl, stand and walk. I never used ones with feet - we just took them off when she woke up, and she was fine. As above, she could stand in it anyway if she wanted to.
We use the ones with legs x
Mine has learnt to crawl in the sack. He struggles to stand but gets on his knees in it
My baby crawls and stands in a sleep sack and it’s fine.