Rollover max parameter in log4j2.yml is "ignored"

The rolling file appender only keeps 7 files, regardless of what I configure the max value to in its DefaultRolloverStrategy.

spring-boot 2.7.15 (snakeyaml 1.33, jackson-databind 2.15.2, Java 17)

Reproduced with log4j2 version 2.17.2 and 2.20.0