I discovered the problem because I'm helping in the development of https://github.com/fiatjaf/njump, that now also support long form content:

https://nostr.com/nevent1qqsvev0u8n30dxt4v5fqe7hsdfgu338yetpu8tqszf86u8raspqf65gppemhxue69uhkummn9ekx7mp0ac4z57

Now you don't see any problem, but is merely a "regex coincidence" that I causally hit and decided to keep because should not give problems :)

I never heard about the < ... > syntax, I would suggest to use the standard one or the "url only" simplified version that every client already use for short notes, so presumably it is supported also in the long format.

PS: I encourage you to use https://nostr.com/| to share your articles so the users can have a fast but nice preview and "jump in nostr" with the preferred client (encourage plurality and interoperability) to read the article.

Bonus point: it is search engine friendly, so the article is proper indexed and we can attract more people on nostr!