Plus in URL no longer resolving

I’m 99% sure this worked fine in the past, but recently I noticed a + in my URL no longer resolves correctly. So for example, this used to work:

https://www.raymondcamden.com/tags/generative+ai

And now gives a 404. I can confirm the file is generated by Eleventy, and resolves locally (although I can’t test with ntl dev due to the CLI erroring with the size of my site). While I can probably just change things to use a - or another character, I wanted to check first if this was a known issue.

I ended up switching to - and it fixed the problem, but still would like to know if something changed.