xzel23 opened a new issue, #4177:
URL: https://github.com/apache/logging-log4j2/issues/4177
## Description
Issue #4129 was included in the release notes of 2.26.1, but I still observe
incorrect formatting after upgrading to that version for these patterns:
"%d{dd-MMMM-yyyy}{de-DE} %p %m%n",
"%d{EEEE, dd. MMMM yyyy}{de-DE} %p %m%n",
I stepped into the Log4J code to make sure the correct Jar is used. Since I
cannot reopen the original issue, I create a new one.
## Configuration
**Version:** 2.26.1
**Operating system:** macOS 26.5.2
**JDK:** BellSoft Liberica-21.0.11-macos-aarch64-javafx
## Logs
Excerpt from my unit test logs (SLB4J is my own backend that aims to provide
a Log4J compatible pattern):
```
Discrepancies found:
Pattern: %d{dd-MMMM-yyyy}{de-DE} %p %m%n
Log4j: [10-July-2026 TRACE Trace message
]
SLB4J: [10-Juli-2026 TRACE Trace message
]
Pattern: %d{dd-MMMM-yyyy}{de-DE} %p %m%n
Log4j: [10-July-2026 DEBUG Debug message
]
SLB4J: [10-Juli-2026 DEBUG Debug message
]
Pattern: %d{dd-MMMM-yyyy}{de-DE} %p %m%n
Log4j: [10-July-2026 INFO Test message
]
SLB4J: [10-Juli-2026 INFO Test message
]
Pattern: %d{dd-MMMM-yyyy}{de-DE} %p %m%n
Log4j: [10-July-2026 WARN Warning message
]
SLB4J: [10-Juli-2026 WARN Warning message
]
Pattern: %d{dd-MMMM-yyyy}{de-DE} %p %m%n
Log4j: [10-July-2026 ERROR Error message
]
SLB4J: [10-Juli-2026 ERROR Error message
]
Expected :true
Actual :false
```
## Reproduction
Same as for #4129.
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