I'll _usually_ leave it open if it looks interesting to me, passes tests, and I know I'll get back to it in my next round of reviews (every quarter or half year

I'll _usually_ leave it open if it looks interesting to me, passes tests, and I know I'll get back to it in my next round of reviews (every quarter or half year, I spend an evening or two of my dedicated OSS time reviewing each project's open issues and PRs to clean things up). I try to at least indicate if it's close to ready for merge or if it will need a bit more work, and don't often immediately close a PR.