Nginx location block matching order -- most specific does not always win

Nginx serves the wrong location block. Adding a new location does not override an existing one as expected.

Priority: (1) Exact = /path. (2) Preferential ^~ /path. (3) Regex ~ (first match wins). (4) Prefix /path (longest wins but regex overrides). Use = for exact and ^~ to prevent regex override.

Nginx checks prefix matches first, then regex patterns. First regex match overrides prefix.