There are quite a few studies here though.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5584749/ (online survey, 84 respondants)
https://pubmed.ncbi.nlm.nih.gov/32820538/ (meta analysis, 6703 total participants across 55 studies)
My reading of this is we can't make claims like X% practicioners have negative outcomes - the numbers are too messy. We can definitely say a significant amount of practictioners do have negative outcomes.
But, those negative outcomes are wide and while they include suicide, depression and panic attacks, the majority of them are things like anxiety.
You are digging into and tinkering with your psyche. Of course there are going to be negative outcomes. I would be more skeptical if the claim was meditation did something and never had negative effects.