When a pillager patrol captain is killed, nearby pillager can pick up banner but doesn't become the next captain

Verification Builds:
1.16.0.58 Beta
Summary:
In 1.16.0.51 pillager can pickup illager banner but doesn't become patrol captain. In Minecraft Wiki page said when a captain is killed, nearby pillagers now rush toward the illager banner to pick it up and become the next captain.
Steps to Reproduce:
1.Find pillager outpost or patrol then find the patrol captain.
2.When a patrol captain is killed, nearby pillagers can pick up illager banner and become the next captain.
3.any nearby illagers can pickup illager banner.
Observed Results:
When patrol captain is killed, nearby pillagers can pickup illager banner but doesn't become the next captain.
Expected results:
When patrol captain is killed, nearby pillagers can pickup illager banner and become next captain. Killing that captain can spawn in a raid.